Power Control Method and Apparatus

ABSTRACT

A power control method, including receiving indication information, where the indication information indicates a power control parameter specific to a bandwidth part, and sending uplink information on the bandwidth part by using a transmit power, where the transmit power is based on the power control parameter specific to the bandwidth part and is further based on a common power control parameter of a carrier in which the bandwidth part is disposed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/568,999, filed on Sep. 12, 2019, which is a continuation ofInternational Application No. PCT/CN2018/108941, filed on Sep. 30, 2018,which claims priority to Chinese Patent Application No. 201710918975.6,filed on Sep. 30, 2017. All of the afore-mentioned patent applicationsare hereby incorporated by reference in their entireties.

TECHNICAL FIELD

This application relates to communications technologies, and inparticular, to a power control method and apparatus.

BACKGROUND

In a communications system in which carrier bandwidth is largebandwidth, a bandwidth capability of a terminal device may be less thanthe carrier bandwidth. For example, in a 5th generation (5G) mobilecommunications system, a bandwidth capability of a terminal device islower than carrier bandwidth. In the 5G system, a network deviceconfigures a part of carrier bandwidth (referred to as a “carrierbandwidth part (BWP)” below) in the carrier bandwidth for the terminaldevice, and allocates some or all resources in the carrier bandwidthpart to the terminal device, for communication between the networkdevice and the terminal device. Bandwidth of the carrier bandwidth partis less than or equal to the bandwidth capability of the terminaldevice.

In some application scenarios, the network device determines thatcarrier bandwidth part switching needs to be performed for the terminaldevice. Because carrier bandwidth parts with different bandwidth sizesmay be corresponding to different transmission parameters, how toperform power control in a scenario in which a carrier bandwidth part isconfigured, to ensure correct reception of uplink information is aproblem that urgently needs to be resolved.

SUMMARY

Embodiments of this application provide a power control method andapparatus, so as to configure different power control parameters basedon different carrier bandwidth parts, thereby ensuring uplink signalquality (or uplink coverage) during carrier bandwidth part switching.

According to a first aspect, an embodiment of this application providesa power control method, including: receiving power control parameterindication information, sending first uplink information on a firstcarrier bandwidth part based on a first transmit power, where the firsttransmit power is determined based on a first power control parameter,and the first power control parameter is determined based on the powercontrol parameter indication information, and sending second uplinkinformation on a second carrier bandwidth part based on a secondtransmit power, where the second transmit power is determined based on asecond power control parameter, and the second power control parameteris determined based on the power control parameter indicationinformation, where the first carrier bandwidth part and the secondcarrier bandwidth part are located in a same carrier.

In the power control method embodiment provided in the first aspect, aterminal device receives the power control parameter indicationinformation sent by a network device, and determines, based on the powercontrol parameter indication information, the first power controlparameter corresponding to the first carrier bandwidth part and thesecond power control parameter corresponding to the second carrierbandwidth part. Further, the terminal device sends the first uplinkinformation to the network device on the first carrier bandwidth partbased on the first transmit power (determined based on the first powercontrol parameter), and sends the second uplink information to thenetwork device on the second carrier bandwidth part based on the secondtransmit power (determined based on the second power control parameter).It can be learned that the network device configures different powercontrol parameters for the terminal device based on different carrierbandwidth parts, so that the terminal device may send information ondifferent carrier bandwidth parts of a same carrier by using differenttransmit powers, thereby ensuring uplink signal quality (or uplinkcoverage) during carrier bandwidth part switching.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, that the first power control parameter isdetermined based on the power control parameter indication informationincludes: the first power control parameter is determined based on areference power control parameter, a reference transmission parameter,and a transmission parameter of the first carrier bandwidth part, andthat the second power control parameter is determined based on the powercontrol parameter indication information includes: the second powercontrol parameter is determined based on a reference power controlparameter, a reference transmission parameter, and a transmissionparameter of the second carrier bandwidth part, where the referencepower control parameter is determined based on the power controlparameter indication information.

In a possible implementation, the reference transmission parameterincludes reference bandwidth, the transmission parameter of the firstcarrier bandwidth part includes first bandwidth of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes second bandwidth of the second carrier bandwidthpart, the reference transmission parameter includes a referencesubcarrier spacing, the transmission parameter of the first carrierbandwidth part includes a first subcarrier spacing of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes a second subcarrier spacing of the secondcarrier bandwidth part, and/or the reference transmission parameterincludes a reference cyclic prefix type, the transmission parameter ofthe first carrier bandwidth part includes a first cyclic prefix type ofthe first carrier bandwidth part, and the transmission parameter of thesecond carrier bandwidth part includes a second cyclic prefix type ofthe second carrier bandwidth part.

In a possible implementation, the first power control parameter includesthe first open-loop power control parameter, the second power controlparameter includes the second open-loop power control parameter, and thereference power control parameter includes a reference open-loop powercontrol parameter.

In a possible implementation, the first power control parameter includesthe first closed-loop power control parameter, the second power controlparameter includes the second closed-loop power control parameter, andthe reference power control parameter includes a reference closed-looppower control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In the power control method embodiment provided in this solution, it isunnecessary to configure a plurality of power control parameters foreach PUCCH format, and therefore signaling overheads generated when thenetwork device sends the power control parameter indication informationcan be reduced.

In a possible implementation, that the first transmit power isdetermined based on a first power control parameter includes: the firsttransmit power is determined based on the first power control parameterand a common power control parameter, and that the second transmit poweris determined based on a second power control parameter includes: thesecond transmit power is determined based on the second power controlparameter and the common power control parameter.

Optionally, the common power control parameter is specific to a cell ora carrier.

In a possible implementation, the common power control parameterincludes a common open-loop power control parameter.

In the power control method embodiment provided in this solution, thenetwork device configures power control parameters for the terminaldevice in a manner of combining a configuration manner specific to acarrier bandwidth part and a configuration manner specific to a cell ora carrier, thereby achieving an objective of configuring, by the networkdevice, different power control parameters for the terminal device basedon different carrier bandwidth parts, so that the terminal device maysend information on different carrier bandwidth parts of a same carrierby using different transmit powers.

According to a second aspect, an embodiment of this application providesa power control method, including: sending power control parameterindication information, where the power control parameter indicationinformation includes a first power control parameter and a second powercontrol parameter, the first power control parameter is used to indicatea first transmit power for transmitting data on a first carrierbandwidth part, and the second power control parameter is used toindicate a second transmit power for transmitting data on a secondcarrier bandwidth part, receiving first uplink information on the firstcarrier bandwidth part, where a transmit power of the first uplinkinformation is the first transmit power, and receiving second uplinkinformation on the second carrier bandwidth part, where a transmit powerof the second uplink information is the second transmit power, where thefirst carrier bandwidth part and the second carrier bandwidth part arelocated in a same carrier.

In the power control method embodiment provided in the second aspect, anetwork device sends the power control parameter indication informationto a terminal device, so that the terminal device determines, based onthe received power control parameter indication information, the firstpower control parameter corresponding to the first carrier bandwidthpart and the second power control parameter corresponding to the secondcarrier bandwidth part. Further, the network device receives, on thefirst carrier bandwidth part, the first uplink information sent by theterminal device by using the first transmit power (determined based onthe first power control parameter), and receives, on the second carrierbandwidth part, the second uplink information sent by the terminaldevice by using the second transmit power (determined based on thesecond power control parameter). It can be learned that the networkdevice configures different power control parameters for the terminaldevice based on different carrier bandwidth parts, so that the terminaldevice may send information on different carrier bandwidth parts of asame carrier by using different transmit powers, thereby ensuring uplinksignal quality (or uplink coverage) during carrier bandwidth partswitching.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In the power control method embodiment provided in this solution, thenetwork device does not need to configure a plurality of power controlparameters for each PUCCH format, and therefore signaling overheadsgenerated when the network device sends the power control parameterindication information can be reduced.

According to a third aspect, an embodiment of this application providesan apparatus, including: a receiving module, configured to receive powercontrol parameter indication information, and a sending module,configured to send first uplink information on a first carrier bandwidthpart based on a first transmit power, where the first transmit power isdetermined based on a first power control parameter, and the first powercontrol parameter is determined based on the power control parameterindication information, where the sending module is further configuredto send second uplink information on a second carrier bandwidth partbased on a second transmit power, where the second transmit power isdetermined based on a second power control parameter, and the secondpower control parameter is determined based on the power controlparameter indication information, where the first carrier bandwidth partand the second carrier bandwidth part are located in a same carrier.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, that the first power control parameter isdetermined based on the power control parameter indication informationincludes: the first power control parameter is determined based on areference power control parameter, a reference transmission parameter,and a transmission parameter of the first carrier bandwidth part, andthat the second power control parameter is determined based on the powercontrol parameter indication information includes: the second powercontrol parameter is determined based on a reference power controlparameter, a reference transmission parameter, and a transmissionparameter of the second carrier bandwidth part, where the referencepower control parameter is determined based on the power controlparameter indication information.

In a possible implementation, the reference transmission parameterincludes reference bandwidth, the transmission parameter of the firstcarrier bandwidth part includes first bandwidth of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes second bandwidth of the second carrier bandwidthpart, the reference transmission parameter includes a referencesubcarrier spacing, the transmission parameter of the first carrierbandwidth part includes a first subcarrier spacing of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes a second subcarrier spacing of the secondcarrier bandwidth part, and/or the reference transmission parameterincludes a reference cyclic prefix type, the transmission parameter ofthe first carrier bandwidth part includes a first cyclic prefix type ofthe first carrier bandwidth part, and the transmission parameter of thesecond carrier bandwidth part includes a second cyclic prefix type ofthe second carrier bandwidth part.

In a possible implementation, the first power control parameter includesthe first open-loop power control parameter, the second power controlparameter includes the second open-loop power control parameter, and thereference power control parameter includes a reference open-loop powercontrol parameter.

In a possible implementation, the first power control parameter includesthe first closed-loop power control parameter, the second power controlparameter includes the second closed-loop power control parameter, andthe reference power control parameter includes a reference closed-looppower control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In a possible implementation, that the first transmit power isdetermined based on a first power control parameter includes: the firsttransmit power is determined based on the first power control parameterand a common power control parameter, and that the second transmit poweris determined based on a second power control parameter includes: thesecond transmit power is determined based on the second power controlparameter and the common power control parameter.

In a possible implementation, the common power control parameterincludes a common open-loop power control parameter.

In a possible implementation, the apparatus may be a terminal device, oran apparatus that can be disposed in a terminal device.

For a beneficial effect of the apparatus provided in the implementationsof the third aspect, refer to the beneficial effect of theimplementations of the first aspect. Details are not described hereinagain.

According to a fourth aspect, an embodiment of this application providesan apparatus, including: a sending module, configured to send powercontrol parameter indication information, where the power controlparameter indication information includes a first power controlparameter and a second power control parameter, the first power controlparameter is used to indicate a first transmit power for transmittingdata on a first carrier bandwidth part, and the second power controlparameter is used to indicate a second transmit power for transmittingdata on a second carrier bandwidth part, and a receiving module,configured to receive first uplink information on the first carrierbandwidth part, where a transmit power of the first uplink informationis the first transmit power, where the receiving module is furtherconfigured to receive second uplink information on the second carrierbandwidth part, where a transmit power of the second uplink informationis the second transmit power, where the first carrier bandwidth part andthe second carrier bandwidth part are located in a same carrier.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In a possible implementation, the apparatus may be a network device, oran apparatus that can be disposed in a network device.

For a beneficial effect of the apparatus provided in the implementationsof the fourth aspect, refer to the beneficial effect of theimplementations of the second aspect. Details are not described hereinagain.

According to a fifth aspect, an embodiment of this application providesan apparatus. The apparatus includes a processor, configured toimplement the functions of the terminal device in the method describedin the first aspect. The apparatus may further include a memory,configured to store a program instruction and data. The memory iscoupled with the processor. The processor may invoke and execute theprogram instruction stored in the memory, to implement the functions ofthe terminal device in the method described in the first aspect. Theapparatus may further include a transceiver, where the transceiver isused by the apparatus to communicate with another device. For example,the another device is a network device.

In a possible implementation, the apparatus includes: the transceiver,the memory, configured to store the program instruction, and theprocessor, configured to receive power control parameter indicationinformation by using the transceiver, where the processor is furtherconfigured to send, by using the transceiver, first uplink informationon a first carrier bandwidth part based on a first transmit power, wherethe first transmit power is determined based on a first power controlparameter, and the first power control parameter is determined based onthe power control parameter indication information, and the processor isfurther configured to send, by using the transceiver, second uplinkinformation on a second carrier bandwidth part based on a secondtransmit power, where the second transmit power is determined based on asecond power control parameter, and the second power control parameteris determined based on the power control parameter indicationinformation, where the first carrier bandwidth part and the secondcarrier bandwidth part are located in a same carrier.

Optionally, the first uplink information may be generated by theprocessor, and/or the second uplink information may be generated by theprocessor.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, that the first power control parameter isdetermined based on the power control parameter indication informationincludes: the first power control parameter is determined based on areference power control parameter, a reference transmission parameter,and a transmission parameter of the first carrier bandwidth part, andthat the second power control parameter is determined based on the powercontrol parameter indication information includes: the second powercontrol parameter is determined based on a reference power controlparameter, a reference transmission parameter, and a transmissionparameter of the second carrier bandwidth part, where the referencepower control parameter is determined based on the power controlparameter indication information.

In a possible implementation, the reference transmission parameterincludes reference bandwidth, the transmission parameter of the firstcarrier bandwidth part includes first bandwidth of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes second bandwidth of the second carrier bandwidthpart, the reference transmission parameter includes a referencesubcarrier spacing, the transmission parameter of the first carrierbandwidth part includes a first subcarrier spacing of the first carrierbandwidth part, and the transmission parameter of the second carrierbandwidth part includes a second subcarrier spacing of the secondcarrier bandwidth part, and/or the reference transmission parameterincludes a reference cyclic prefix type, the transmission parameter ofthe first carrier bandwidth part includes a first cyclic prefix type ofthe first carrier bandwidth part, and the transmission parameter of thesecond carrier bandwidth part includes a second cyclic prefix type ofthe second carrier bandwidth part.

In a possible implementation, the first power control parameter includesthe first open-loop power control parameter, the second power controlparameter includes the second open-loop power control parameter, and thereference power control parameter includes a reference open-loop powercontrol parameter.

In a possible implementation, the first power control parameter includesthe first closed-loop power control parameter, the second power controlparameter includes the second closed-loop power control parameter, andthe reference power control parameter includes a reference closed-looppower control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In a possible implementation, that the first transmit power isdetermined based on a first power control parameter includes: the firsttransmit power is determined based on the first power control parameterand a common power control parameter, and that the second transmit poweris determined based on a second power control parameter includes: thesecond transmit power is determined based on the second power controlparameter and the common power control parameter.

In a possible implementation, the common power control parameterincludes a common open-loop power control parameter.

In a possible implementation, the apparatus may be a terminal device, oran apparatus that can be disposed in a terminal device.

For a beneficial effect of the apparatus provided in the implementationsof the fifth aspect, refer to the beneficial effect of theimplementations of the first aspect. Details are not described hereinagain.

According to a sixth aspect, an embodiment of this application providesa chip system. The chip system includes a processor, configured toimplement the functions of the terminal device in the method describedin the first aspect, and may further include a memory. The chip systemmay include a chip, or may include a chip and another discrete device.

According to a seventh aspect, an embodiment of this applicationprovides a program. When being executed by a processor, the program isused to perform the method in the first aspect.

According to an eighth aspect, an embodiment of this applicationprovides a computer program product including an instruction. When theinstruction runs on a computer, the computer is enabled to perform themethod in the first aspect.

According to a ninth aspect, an embodiment of this application providesa computer readable storage medium. The computer readable storage mediumstores an instruction. When the instruction runs on a computer, thecomputer is enabled to perform the method in the first aspect.

According to a tenth aspect, an embodiment of this application providesan apparatus. The apparatus includes a processor, configured toimplement the functions of the network device in the method described inthe second aspect. The apparatus may further include a memory,configured to store a program instruction and data. The memory iscoupled with the processor. The processor may invoke and execute theprogram instruction stored in the memory, to implement the functions ofthe network device in the method described in the second aspect. Theapparatus may further include a transceiver, where the transceiver isused by the apparatus to communicate with another device. For example,the another device is a terminal device.

In a possible implementation, the apparatus includes: the transceiver,the memory, configured to store the program instruction, and theprocessor, configured to send power control parameter indicationinformation by using the transceiver, where the power control parameterindication information includes a first power control parameter and asecond power control parameter, the first power control parameter isused to indicate a first transmit power for transmitting data on a firstcarrier bandwidth part, and the second power control parameter is usedto indicate a second transmit power for transmitting data on a secondcarrier bandwidth part, where the processor is further configured toreceive first uplink information on the first carrier bandwidth part,where a transmit power of the first uplink information is the firsttransmit power, and the processor is further configured to receivesecond uplink information on the second carrier bandwidth part, where atransmit power of the second uplink information is the second transmitpower, where the first carrier bandwidth part and the second carrierbandwidth part are located in a same carrier.

Optionally, the power control parameter indication information may begenerated by the processor.

In a possible implementation, the first power control parameter includesa first open-loop power control parameter, and the second power controlparameter includes a second open-loop power control parameter.

In a possible implementation, the first power control parameter includesa first closed-loop power control parameter, and the second powercontrol parameter includes a second closed-loop power control parameter.

In a possible implementation, the first uplink information includes datacarried on a first physical uplink control channel (PUCCH), a PUCCHformat of the first PUCCH is a first preset PUCCH format, and the firstpreset PUCCH format is some or all of first available PUCCH formats, andthe second uplink information includes data carried on a second PUCCH, aPUCCH format of the second PUCCH is a second preset PUCCH format, andthe second preset PUCCH format is some or all of second available PUCCHformats.

In a possible implementation, the apparatus may be a network device, oran apparatus that can be disposed in a network device.

For a beneficial effect of the apparatus provided in the implementationsof the tenth aspect, refer to the beneficial effect of theimplementations of the second aspect. Details are not described hereinagain.

According to an eleventh aspect, an embodiment of this applicationprovides a chip system. The chip system includes a processor, configuredto implement the functions of the network device in the method describedin the second aspect, and may further include a memory. The chip systemmay include a chip, or may include a chip and another discrete device.

According to a twelfth aspect, an embodiment of this applicationprovides a program. When being executed by a processor, the program isused to perform the method in the second aspect.

According to a thirteenth aspect, an embodiment of this applicationprovides a computer program product including an instruction. When theinstruction runs on a computer, the computer is enabled to perform themethod in the second aspect.

According to a fourteenth aspect, an embodiment of this applicationprovides a computer readable storage medium. The computer readablestorage medium stores an instruction. When the instruction runs on acomputer, the computer is enabled to perform the method in the secondaspect.

In the power control method and apparatus provided in the embodiments ofthis application, the network device sends the power control parameterindication information to the terminal device, so that the terminaldevice determines, based on the received power control parameterindication information, the first power control parameter correspondingto the first carrier bandwidth part and the second power controlparameter corresponding to the second carrier bandwidth part. Further,the terminal device sends the first uplink information to the networkdevice on the first carrier bandwidth part based on the first transmitpower (determined based on the first power control parameter), and sendsthe second uplink information to the network device on the secondcarrier bandwidth part based on the second transmit power (determinedbased on the second power control parameter). It can be learned that thenetwork device configures different power control parameters for theterminal device based on different carrier bandwidth parts, so that theterminal device may send information on different carrier bandwidthparts of a same carrier by using different transmit powers, therebyensuring uplink signal quality (or uplink coverage) during carrierbandwidth part switching.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic structural diagram of a communications systemaccording to an embodiment of this application;

FIG. 1B is a schematic structural diagram of a carrier bandwidth partaccording to an embodiment of this application;

FIG. 1C is another schematic structural diagram of carrier bandwidthparts that are in carrier bandwidth and that are consecutive infrequency domain according to an embodiment of this application;

FIG. 2 is a schematic flowchart of a power control method according toan embodiment of this application;

FIG. 3 is a schematic structural diagram of a power control apparatusaccording to an embodiment of this application;

FIG. 4 is a schematic structural diagram of a power control apparatusaccording to another embodiment of this application;

FIG. 5 is a schematic structural diagram of a power control apparatusaccording to another embodiment of this application; and

FIG. 6 is a schematic structural diagram of a power control apparatusaccording to another embodiment of this application.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

First, a communications system and some terms in the embodiments of thisapplication are explained and described.

FIG. 1A is a schematic structural diagram of a communications systemaccording to an embodiment of this application. As shown in FIG. 1A, thecommunications system may include a network device 01 and a terminaldevice 02. Certainly, the communications system may alternativelyinclude a plurality of terminal devices 02. Considering that processesof configuring, by the network device 01, power control parameters forthe terminal devices 02 are similar to each other, in the embodiments ofthis application, description is provided by using an example in whichthe network device 01 configures, based on different carrier bandwidthparts of any terminal device 02, different power control parameters forthe terminal device 02.

In the embodiments of this application, an apparatus that performs amethod on a network device side may be the network device, or may be anapparatus in the network device. For example, the apparatus in thenetwork device may be a chip system, a circuit, or a module. This is notlimited in this application.

In the embodiments of this application, an apparatus that performs amethod on a terminal device (or referred to as terminal) side may be theterminal device, or may be an apparatus in the terminal device. Forexample, the apparatus in the terminal device may be a chip system, acircuit, or a module. This is not limited in this application. Inmethods provided in the embodiments of this application, the methodsprovided in the embodiments of this application are described by usingan example in which the network device and the terminal device performdata transmission.

Optionally, the communications system may be a long term evolution (LTE)communications system or a 5G mobile communications system. Certainly,the communications system may be alternatively another type ofcommunications system. This is not limited in the embodiments of thisapplication.

The network device in this application may include but is not limited toa base station and a transmission reception point (TRP). The basestation is also referred to as a radio access network (RAN) device, andis a device that connects a terminal to a wireless network. The basestation may be a base transceiver station (BTS) in global system formobile communications (GSM) or code division multiple access (CDMA), ormay be a NodeB (NB) in wideband code division multiple access (WCDMA),or may be an evolved NodeB (eNB or eNodeB) in long term evolution (LTE),a relay station, an access point, a base station on a future 5G network,or the like. This is not limited herein.

The terminal device in this application may be a wireless terminal or awired terminal. The wireless terminal may be a device that provides auser with connectivity of voice and/or other service data, a handhelddevice with a wireless connection function, or another processing deviceconnected to a wireless modem. The wireless terminal may communicatewith one or more core networks through a radio access network (RAN). Thewireless terminal may be a mobile terminal, such as a mobile phone (orreferred to as a “cellular” phone) and a computer with a mobileterminal, for example, may be a portable, pocket-sized, handheld,computer built-in, or in-vehicle mobile apparatus, which exchanges voiceand/or data with the radio access network. For example, the wirelessterminal may be a device such as a personal communications service (PCS)phone, a cordless phone, a session initiation protocol (SIP) phone, awireless local loop (WLL) station, or a personal digital assistant(PDA). The wireless terminal may also be referred to as a system, asubscriber unit, a subscriber station, a mobile station, a mobileconsole (mobile), a remote station, a remote terminal, an accessterminal, a user terminal, a user agent, or user equipment (user deviceor user equipment). This is not limited herein. The terminal device mayalso be referred to as a terminal for short.

The terminal device or the network device in this application mayinclude a hardware layer, an operating system layer running above thehardware layer, and an application layer running above the operatingsystem layer. The hardware layer includes hardware such as a centralprocessing unit (CPU), a memory management unit (MMU), and a memory(also referred to as a main memory). The operating system may be any oneor more computer operating systems that implement service processing byusing a process, such as a Linux operating system, a UNIX operatingsystem, an Android operating system, an iOS operating system, or aWindows operating system. The application layer includes applicationssuch as a browser, an address book, word processing software, andinstant communication software.

A bandwidth capability of the terminal device in the embodiments of thisapplication is maximum transmission bandwidth that can be supported bythe terminal device. A larger bandwidth capability of the terminaldevice correspondingly indicates a higher processing capability of theterminal device and a higher data transmission rate of the terminaldevice, but may result in higher design costs of the terminal device andhigher power consumption of the terminal device. In a wirelesscommunications system, bandwidth capabilities of different terminaldevices may be the same or different. This is not limited in theembodiments of this application. Optionally, the terminal device mayreport the bandwidth capability of the terminal device to the networkdevice by using a preamble or a message 3 during initial access, or mayreport the bandwidth capability of the terminal device to the networkdevice by using higher layer signaling. Certainly, the network devicemay alternatively obtain the bandwidth capability of the terminal devicein another manner. This is not limited in the embodiments of thisapplication.

In the embodiments of this application, the network device allocates acarrier bandwidth part for the terminal device from a system frequencyresource, and allocates some or all resources in the carrier bandwidthpart to the terminal device, for communication between the networkdevice and the terminal device. Optionally, the system frequencyresource may also be referred to as a system resource or a transmissionresource. In frequency domain, a width of the system frequency resourcemay be referred to as bandwidth of the system frequency resource, or maybe referred to as system bandwidth, transmission bandwidth, or carrierbandwidth.

In the embodiments of this application, one carrier bandwidth part isrelated to one specific system parameter. The system parameter includesat least one of a subcarrier spacing and a cyclic prefix (CP) type.Certainly, the system parameter may alternatively include anotherparameter. This is not limited in the embodiments of this application.

The carrier bandwidth part in the embodiments of this application isincluded in the system frequency resource, and may be resources that areconsecutive or inconsecutive in frequency domain in the system frequencyresource, or may be all resources in the system frequency resource. Thecarrier bandwidth part in the embodiments of this application may alsobe referred to as a bandwidth part, a frequency resource part, a partialfrequency resource, a subband, a narrow band, or another name. This isnot limited in this application.

For example, one carrier bandwidth part includes K (K>0) consecutive orinconsecutive subcarriers, or one carrier bandwidth part includes afrequency domain resource corresponding to N (N>0) non-overlappingconsecutive or inconsecutive resource blocks, or one carrier bandwidthpart includes a frequency domain resource corresponding to M (M>0)non-overlapping consecutive or inconsecutive resource block groups(RBG), where one RBG includes P (P>0) consecutive RBs.

For example, when the carrier bandwidth part is a segment of consecutiveresources in the system frequency resource, as shown in FIG. 1B (FIG. 1Bis a schematic structural diagram of a carrier bandwidth part accordingto an embodiment of this application), the carrier bandwidth part may besome or all resources in carrier bandwidth. For example, bandwidth ofthe carrier bandwidth part is W, and a center frequency is F, therefore,frequencies at boundary points of the carrier bandwidth part are F−W/2and F+W/2, or this may be described as that a highest frequency in thecarrier bandwidth part is F+W/2 and a lowest frequency in the carrierbandwidth part is F−W/2.

FIG. 1C is another schematic structural diagram of carrier bandwidthparts that are in carrier bandwidth and that are consecutive infrequency domain according to an embodiment of this application. Asshown in FIG. 1C, the carrier bandwidth includes a total of threedifferent carrier bandwidth parts: a carrier bandwidth part 0, a carrierbandwidth part 1, and a carrier bandwidth part 2. In actual application,the carrier bandwidth may include any integral quantity of carrierbandwidth parts. This is not limited in this application. Meanings ofdifferent carrier bandwidth parts are described by using a carrierbandwidth part A and a carrier bandwidth part B as an example. That thecarrier bandwidth part A is different from the carrier bandwidth part Bincludes: (1) Some or all of frequency resources included in the carrierbandwidth part A are not included in the carrier bandwidth part B. (2)Some or all of frequency resources included in the carrier bandwidthpart B are not included in the carrier bandwidth part A. (3) A systemparameter corresponding to the carrier bandwidth part A is differentfrom a system parameter corresponding to the carrier bandwidth part B.Optionally, the system parameter includes at least one of the following:a subcarrier spacing and a CP type. Optionally, the system parameter mayinclude numerology used in a process of studying and formulating awireless communications system standard by the 3rd generationpartnership project (3GPP).

In the embodiments of this application, in some application scenarios(for example, a multi-numerology scenario or a bandwidth part fall-backscenario), the network device determines that carrier bandwidth partswitching needs to be performed for the terminal device, and mayactivate or deactivate a carrier bandwidth part by using dynamicsignaling. Optionally, the dynamic signaling may include downlinkcontrol information (DCI), or certainly, may include other information.This is not limited in the embodiments of this application. When thecarrier bandwidth part is activated, the terminal device monitors adownlink control channel corresponding to the carrier bandwidth part,and transmits data on the carrier bandwidth part indicated by DCItransmitted on the downlink control channel, and/or performs referencesignal measurement on the carrier bandwidth part. When the carrierbandwidth part is deactivated, the terminal device does not monitor thedownlink control channel corresponding to the carrier bandwidth part,and/or does not transmit a reference signal on the carrier bandwidthpart. It can be learned that dynamic carrier bandwidth part switchingmay be implemented through such dynamic activation or deactivation ofthe carrier bandwidth part, that is, the terminal device sends orreceives data in a time division manner on different carrier bandwidthparts. It should be noted that the “downlink control channelcorresponding to the carrier bandwidth part” is a downlink controlchannel (which may be on the carrier bandwidth part, or may not be onthe carrier bandwidth part) used to schedule the carrier bandwidth part,and/or a downlink control channel that is included in the carrierbandwidth part and that is used to schedule another carrier bandwidthpart.

Power control in the embodiments of this application is: on a basis ofevaluating an indicator on a receiver side, such as received signalstrength or a signal-to-noise ratio, changing a transmit power in atimely manner to compensate for a path loss and fading on a radiochannel, thereby maintaining communication quality without generatingadditional interference to another terminal device on a same radioresource. In addition, power control results in a decrease in atransmitter power, thereby extending a service time of a battery.Optionally, uplink power control is mainly for a physical uplink sharedchannel (PUSCH), a physical uplink control channel (PUCCH), and asounding reference signal (SRS). The PUSCH is used by the terminaldevice to send uplink data information. The PUCCH is used by theterminal device to send uplink control information, for example, aresponse (acknowledgement/negative acknowledgement, ACK/NACK) andchannel quality information (CQI). The SRS is used by the network deviceto estimate uplink channel quality.

Numbers in the embodiments of this application, such as “first” and“second”, are used to distinguish between similar objects, but are notnecessarily used to describe a specific sequence or chronological order,and should not constitute any limitation on embodiments of thisapplication.

In addition, in a possible implementation, a manner of determining, bythe terminal device, an uplink transmit power based on a power controlparameter configured by the network device is described in detail.

(1) It is assumed that when the terminal device sends a PUSCH (no PUCCHneeds to be sent) in a subframe i of a cell c or a carrier c, a PUSCHtransmit power is determined based on the following formula (1):

$\begin{matrix}{{P_{{PUSCH},c}(i)} = {\min {\begin{Bmatrix}{P_{{CMAX},c}(i)} \\\begin{matrix}{{10\; {\log_{10}\left( {M_{{PUSCH},c}(i)} \right)}} + P_{{O\_ PUSCH},c} +} \\{{\alpha_{c} \cdot {PL}_{c}} + {\Delta_{{TF},c}(i)} + {f_{c}(i)}}\end{matrix}\end{Bmatrix}\mspace{14mu}\lbrack{dBm}\rbrack}}} & (1)\end{matrix}$

where P_(CMAX,c)(i) is a maximum transmit power of the terminal devicein the subframe t of the cell c or the carrier c, M_(PUSCH,c)(i) is aquantity of RBs that are allocated by the network device to the terminaldevice in the subframe i of the cell c or the carrier c, P_(O_PUSCH,c)is a receive power expected by the network device, whereP_(O_PUSCH,c)=P_(O_UE_PUSCH,c)+P_(O_NOMINAL_PUSCH,c),P_(O_NOMINAL_PUSCH,c) represents a PUSCH transmit power that is expectedby the network device for normal demodulation and that is configured byusing higher layer signaling, and P_(O_UE_PUSCH,c) is a power offset,configured by using higher layer signaling, of the terminal devicerelative to P_(O_NOMINAL_PUSCH,c), PL_(c) is a downlink path lossestimate that is estimated by the terminal device, ac is a path losscompensation factor configured by using higher layer signaling and has avalue range from 0 to 1, Δ_(TF,c)(i) is a power offset value of adifferent modulation and coding scheme (modulation and coding scheme,MCS) format relative to a reference MCS format, and f_(c)(i) is anadjustment value of a PUSCH transmit power of the terminal device, andis obtained through mapping by using transmit power control (TPC)information in a PDCCH, where f_(c)(i) is obtained by using a PUSCHpower control algorithm, and power control includes a cumulative typeand an absolute type. The cumulative type means adding a poweradjustment value based on last f_(c)(i), that is,f_(c)(i)=f_(c)(i−1)+δ_(PUSCH,c)(i−K_(PUSCH)), where δ_(PUSCH,c) is apower adjustment value indicated by the TPC in the physical downlinkcontrol channel (PDCCH), K_(PUSCH)=4 for frequency division duplex(FDD), and K_(PUSCH) is determined based on a TDD uplink-downlinkconfiguration for time division duplex (TDD), and the absolute typemeans that a value of f_(c)(i) is equal to a power adjustment valueindicated by the TPC in the PDCCH.

(2) It is assumed that when the terminal device sends both a PUSCH and aPUCCH in a subframe i of a cell c or a carrier c, a PUSCH transmit poweris determined based on the following formula (2):

$\begin{matrix}{{P_{{PUSCH},c}(i)} = {\min {\begin{Bmatrix}{10\; {\log_{10}\left( {{{\hat{P}}_{{CMAX},c}(i)} - {{\hat{P}}_{{PUCCH},c}(i)}} \right)}} \\\begin{matrix}{{10\; {\log_{10}\left( {M_{{PUSCH},c}(i)} \right)}} + P_{{O\_ PUSCH},c} +} \\{{\alpha_{c} \cdot {PL}_{c}} + {\Delta_{{TF},c}(i)} + {f_{c}(i)}}\end{matrix}\end{Bmatrix}\mspace{14mu}\lbrack{dBm}\rbrack}}} & (2)\end{matrix}$

where meanings of M_(PUSCH,c)(i), P_(O_PUSCH,c), α_(c), PL_(c),Δ_(TF,c)(i), and f_(c)(i) are the same as those described above,{circumflex over (P)}_(CMAX,c)(i) is a linear value of P_(CMAX,c)(i),where a meaning of P_(CMAX,c)(i) is the same as that described above,and {circumflex over (P)}_(PUCCH,c)(i) is a linear value ofP_(PUCCH,c)(i), where P_(PUCCH,c) is a PUCCH transmit power in thefollowing descriptions.

(3) It is assumed that when the terminal device sends a PUCCH in asubframe i of a cell c or a carrier c, a PUCCH transmit power isdetermined based on the following formula (3):

$\begin{matrix}{{P_{{PUCCH},c}(i)} = {\min {\begin{Bmatrix}{P_{{CMAX},c}(i)} \\\begin{matrix}{P_{{O\_ PUCCH},c} + {PL}_{c} + {h_{c}\left( {n_{CQI},n_{HARQ},n_{SR}} \right)} +} \\{{\Delta_{{F\_ PUCCH},c}(F)} + {\Delta_{{TxD},c}\left( F^{\prime} \right)} + {g_{c}(i)}}\end{matrix}\end{Bmatrix}\mspace{14mu}\lbrack{dBm}\rbrack}}} & (3)\end{matrix}$

where meanings of P_(CMAX,c)(i) and PL_(c) are the same as thosedescribed above, P_(O_PUCCH,c) is a reference power value (that is, areceive power expected by the network device) configured by using higherlayer signaling, whereP_(O_PUCCH,c)=P_(O_UE_PUCCH,c)+P_(O_NOMINAL_PUCCH,c),P_(O_NOMINAL_PUCCH,c) represents a PUCCH transmit power that is expectedby the network device for normal demodulation and that is configured byusing higher layer signaling, and P_(O_UE_PUCCH,c) is a power offset,configured by using higher layer signaling, of the terminal devicerelative to P_(O_NOMINAL_PUCCH,c), h_(c)(n_(CQI),n_(HARQ),n_(SR)) is aPUCCH transmit power offset configured based on a quantity of bits ofCQI and an ACK that are carried, Δ_(F_PUCCH,c)(F) is determined based ona relative relationship between a used PUCCH format and a PUCCH format1a, Δ_(TxD,c)(F) is a transmit power offset configured by using higherlayer signaling when the PUCCH is sent by using two antenna ports, andg_(c)(i) is a closed-loop power control adjustment value of the terminaldevice, and is obtained through mapping by using TPC information in thePDCCH, where g_(c)(i) is obtained by using a PUCCH power controlalgorithm, and power control includes a cumulative type and an absolutetype. The cumulative type means adding a power adjustment value based onlast g_(c)(i), that is, g_(c)(i)=g_(c)(i−1)+Σ_(m=0)^(M−1)δ_(PUCCH,c)(i−k_(m)), where δ_(PUCCH,c) is a power adjustmentvalue indicated by the TPC in the PDCCH, M=1 and k₀=4 for FDD, and M andk_(m) are determined based on a TDD uplink-downlink configuration forTDD, and the absolute type means that a value of g_(c)(i) is equal to apower adjustment value indicated by the TPC in the PDCCH.

(4) It is assumed that when the terminal device sends an SRS in asubframe i of a cell c or a carrier c, an SRS transmit power isdetermined based on the following formula (4):

$\begin{matrix}{{P_{{SRS},c}(i)} = {\min {\begin{Bmatrix}{P_{{CMAX},c}(i)} \\\begin{matrix}{P_{{SRS\_ OFFSET},c} + {10\; {\log_{10}\left( M_{{SRS},c} \right)}} +} \\{P_{{O\_ PUSCH},c} + {\alpha_{c} \cdot {PL}_{c}} + {f_{c}(i)}}\end{matrix}\end{Bmatrix}\mspace{14mu}\lbrack{dBm}\rbrack}}} & (4)\end{matrix}$

where meanings of P_(CMAX,c)(i), P_(O_PUSCH,c), α_(c), PL_(c), andf_(c)(i) are the same as those described above, P_(SRS_OFFSET,c) is apower offset value configured in a semi-static manner by using higherlayer signaling, and M_(SRS,c) is a quantity of RBs used fortransmitting the SRS.

Usually, in a communications system in which carrier bandwidth is largebandwidth, a bandwidth capability of a terminal device may be less thanthe carrier bandwidth. For example, in a new radio (NR) technology of a5G mobile communications system, maximum carrier bandwidth may be 400MHz, and a bandwidth capability of a terminal device may be 20 MHz, 50MHz, 100 MHz, or the like. In the 5G system, a network device configuresa part of carrier bandwidth (referred to as a “carrier bandwidth part”below) in carrier bandwidth for the terminal device, and allocates someor all resources in the carrier bandwidth part to the terminal device,for communication between the network device and the terminal device.Bandwidth of the carrier bandwidth part is less than or equal to thebandwidth capability of the terminal device.

In some application scenarios (for example, a multi-numerology scenarioor a bandwidth part fallback scenario), the network device determinesthat carrier bandwidth part switching needs to be performed for theterminal device. Because carrier bandwidth parts with differentbandwidth sizes are corresponding to different frequency diversitygains, to ensure correct reception of uplink information, transmitpowers used by the terminal device to send information on carrierbandwidth parts with different bandwidth sizes should also be different.

In the foregoing method, the network device configures a power controlparameter for the terminal device in a configuration manner specific toa cell or a carrier (that is, a manner of performing independentconfiguration for different cells or carriers), that is, the terminaldevice uses a same power control parameter on all frequency resources ina cell or a carrier.

In a scenario in which a carrier bandwidth part is configured,configurations of different carrier bandwidth parts may be different. Inthis scenario, how to perform power control is a problem worth studying,to ensure correct reception of uplink information. In a power controlmethod and apparatus provided in the embodiments of this application, anetwork device configures a power control parameter for a terminaldevice in a configuration manner specific to a carrier bandwidth part(that is, a manner of performing independent configuration for differentcarrier bandwidth parts), so that the network device configuresdifferent power control parameters for the terminal device based ondifferent carrier bandwidth parts, and the terminal device may sendinformation on different carrier bandwidth parts by using differenttransmit powers, thereby ensuring uplink signal quality (or uplinkcoverage) during carrier bandwidth part switching.

A first carrier bandwidth part and a second carrier bandwidth part inthe embodiments of this application may be located on a same carrier.Optionally, the first carrier bandwidth part and the second carrierbandwidth part may be alternatively located on different carriers. Forexample, in a scenario in which LTE and NR coexist, a first carrierbandwidth part is located on an NR dedicated uplink carrier orfrequency, and a second carrier bandwidth part is located on asupplementary uplink (SUL) carrier or frequency. The dedicated uplinkcarrier and the supplementary uplink carrier may belong to a same cell.

By using specific embodiments, the following describes in detailtechnical solutions of this application and how to resolve the foregoingtechnical problems by using the technical solutions of this application.The following several specific embodiments may be combined with oneanother. Same or similar concepts or processes may not be described indetail in some embodiments.

FIG. 2 is a schematic flowchart of a power control method according toan embodiment of this application. As shown in FIG. 2, the method in theembodiments of this application may include the following steps.

Step S201: A network device sends power control parameter indicationinformation.

Optionally, the power control parameter indication information is usedto indicate a power control parameter corresponding to each of at leastone carrier bandwidth part allocated by the network device to a terminaldevice.

For example, assuming that the network device allocates a carrierbandwidth part A to the terminal device on a carrier, the power controlparameter indication information is used to indicate a power controlparameter A corresponding to the carrier bandwidth part A (for example,the carrier bandwidth part A may be a first carrier bandwidth part inthe embodiments of this application, and the corresponding power controlparameter A may be a first power control parameter, or the carrierbandwidth part A may be a second carrier bandwidth part in theembodiments of this application, and the corresponding power controlparameter A may be a second power control parameter).

For another example, assuming that the network device allocates a firstcarrier bandwidth part and a second carrier bandwidth part to theterminal device, the power control parameter indication information isused to indicate a first power control parameter corresponding to thefirst carrier bandwidth part and a second power control parametercorresponding to the second carrier bandwidth part.

For another example, assuming that the network device allocates a firstcarrier bandwidth part, a second carrier bandwidth part, and a thirdcarrier bandwidth part to the terminal device, the power controlparameter indication information is used to indicate at least one of afirst power control parameter corresponding to the first carrierbandwidth part, a second power control parameter corresponding to thesecond carrier bandwidth part, and a third power control parametercorresponding to the third carrier bandwidth part. Optionally, the firstcarrier bandwidth part, the second carrier bandwidth part, and the thirdcarrier bandwidth part may be located on a same carrier. Optionally, thefirst carrier bandwidth part, the second carrier bandwidth part, and thethird carrier bandwidth part may be alternatively located on differentcarriers.

It should be noted that the network device may alternatively allocateany quantity of carrier bandwidth parts to the terminal device. This isnot limited in the embodiments of this application. In addition, thepower control parameter indication information may be alternatively usedto indicate other information. This is not limited in the embodiments ofthis application either.

In the embodiments of this application, when the power control parameterindication information is used to indicate power control parameterscorresponding to at least two carrier bandwidth parts, power controlparameters that are corresponding to the at least two carrier bandwidthparts and that are indicated by the power control parameter indicationinformation (for example, the first power control parametercorresponding to the first carrier bandwidth part, the second powercontrol parameter corresponding to the second carrier bandwidth part,and the third power control parameter corresponding to the third carrierbandwidth part) may be the same or different. In this case, differentpower control parameters are configured for the terminal device based ondifferent carrier bandwidth parts.

Optionally, the first power control parameter in the embodiments of thisapplication may include a first open-loop power control parameter. Forexample, when the first carrier bandwidth part is used to send at leastone of an SRS and data carried on a PUSCH, the first open-loop powercontrol parameter may be a receive power P_(O_PUSCH,c,BWP1) expected bythe network device, or the first open-loop power control parameter mayinclude a PUSCH transmit power P_(O_NOMINAL_PUSCH,c,BWP1) that isexpected by the network device for normal demodulation and that isconfigured by using higher layer signaling, and a power offsetP_(O_UE_PUSCH,c,BWP1), configured by using higher layer signaling, ofthe terminal device relative to P_(O_NOMINAL_PUSCH,c,BWP1). Thesubscript c,BWP1 is corresponding to the first carrier bandwidth part ofa cell c or a carrier c. In some possible embodiments, the subscriptc,BWP1 may be a subscript BWP1, corresponding to the first carrierbandwidth part. This is not limited in this application.

For another example, when the first carrier bandwidth part is used tosend data carried on a PUCCH, the first open-loop power controlparameter may be a receive power P_(O_PUCCH,c,BWP1) expected by thenetwork device, or the first open-loop power control parameter mayinclude a PUCCH transmit power P_(O_NOMIN_PUCCH,c,BWP1) that is expectedby the network device for normal demodulation and that is configured byusing higher layer signaling, and a power offset P_(O_UE_PUCCH,c,BWP1),configured by using higher layer signaling, of the terminal devicerelative to P_(O_NOMINAL_PUCCH,c,BWP1). The subscript c,BWP1 iscorresponding to the first carrier bandwidth part of a cell c or acarrier c. In some possible embodiments, the subscript c,BWP1 may be asubscript BWP1, corresponding to the first carrier bandwidth part. Thisis not limited in this application.

Optionally, the first power control parameter in the embodiments of thisapplication may include a first closed-loop power control parameter. Forexample, when the first carrier bandwidth part is used to send at leastone of an SRS and data carried on a PUSCH, and power control is of anabsolute type, the first closed-loop power control parameter may be apower adjustment value δ_(PUSCH,c,BWP1) indicated by TPC in a PDCCH, orwhen the first carrier bandwidth part is used to send at least one of anSRS and data carried on a PUSCH, and power control is of a cumulativetype, the first closed-loop power control parameter may include a poweradjustment value δ_(PUSCH,c,BWP1) indicated by TPC in a PDCCH, andoptionally, the first closed-loop power control parameter may include aninitial value f_(c,BWP1)(0) of an adjustment value of a PUSCH transmitpower and/or an SRS transmit power of the terminal device. The subscriptc,BWP1 is corresponding to the first carrier bandwidth part of a cell cor a carrier c. In some possible embodiments, the subscript c,BWP1 maybe a subscript BWP1, corresponding to the first carrier bandwidth part.This is not limited in this application.

For another example, when the first carrier bandwidth part is used tosend data carried on a PUCCH, and power control is of an absolute type,the first closed-loop power control parameter may be a power adjustmentvalue δ_(PUCCH,c,BWP1) indicated by TPC in a PDCCH, or when the firstcarrier bandwidth part is used to send data carried on a PUCCH, andpower control is of a cumulative type, the first closed-loop powercontrol parameter may include a power adjustment value δ_(PUCCH,c,BWP1)indicated by TPC in a PDCCH, and optionally, the first closed-loop powercontrol parameter may include an initial value g_(c,BWP1)(0) of anadjustment value of a PUCCH transmit power of the terminal device. Thesubscript c,BWP1 is corresponding to the first carrier bandwidth part ofa cell c or a carrier c. In some possible embodiments, the subscriptc,BWP1 may be a subscript BWP1, corresponding to the first carrierbandwidth part. This is not limited in this application.

Optionally, the first power control parameter in the embodiments of thisapplication may include a first maximum transmit power parameter, forexample, P_(CMAX,c,BWP1)(i). The subscript c,BWP1 is corresponding tothe first carrier bandwidth part of a cell c or a carrier c. In somepossible embodiments, the subscript c,BWP1 may be a subscript BWP1,corresponding to the first carrier bandwidth part. This is not limitedin this application.

Optionally, the first power control parameter in the embodiments of thisapplication may include a first downlink path loss estimate PL_(c,BWP1).The subscript c,BWP1 is corresponding to the first carrier bandwidthpart of a cell c or a carrier c. In some possible embodiments, thesubscript c,BWP1 may be a subscript BWP1, corresponding to the firstcarrier bandwidth part. This is not limited in this application.

Optionally, when the first carrier bandwidth part is used to send anyone of an SRS and data carried on a PUSCH, the first power controlparameter in the embodiments of this application may include a firstpath loss compensation factor α_(c,BWP1) configured by using higherlayer signaling. The subscript c,BWP1 is corresponding to the firstcarrier bandwidth part of a cell c or a carrier c. In some possibleembodiments, the subscript c,BWP1 may be a subscript BWP1, correspondingto the first carrier bandwidth part. This is not limited in thisapplication.

Optionally, when the first carrier bandwidth part is used to send anSRS, the first power control parameter in the embodiments of thisapplication may include a power offset value P_(SRS_OFFSET,c,BWP1)configured by using higher layer signaling. The subscript c,BWP1 iscorresponding to the first carrier bandwidth part of a cell c or acarrier c. In some possible embodiments, the subscript c,BWP1 may be asubscript BWP1, corresponding to the first carrier bandwidth part. Thisis not limited in this application.

Optionally, when the first carrier bandwidth part is used to send datacarried on a PUCCH, the first power control parameter in the embodimentsof this application may include a first PUCCH format related powercontrol parameter, including a power control parameterΔ_(F_PUCCH,c,BWP1)(F) determined based on a relative relationshipbetween a used PUCCH format and a PUCCH format 1a, and/or a transmitpower offset Δ_(TxD,c,BWP1)(F′) configured by using higher layersignaling. The subscript c,BWP1 is corresponding to the first carrierbandwidth part of a cell c or a carrier c. In some possible embodiments,the subscript c,BWP1 may be a subscript BWP1, corresponding to the firstcarrier bandwidth part. This is not limited in this application.

Optionally, when the first carrier bandwidth part is used to send datacarried on a PUSCH, the first power control parameter may include acombination of at least any two of the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,and the first path loss compensation factor. Certainly, the first powercontrol parameter may further include another parameter. This is notlimited in the embodiments of this application.

Optionally, when the first carrier bandwidth part is used to send anSRS, the first power control parameter may include a combination of atleast any two of the first open-loop power control parameter, the firstclosed-loop power control parameter, the first maximum transmit powerparameter, the first downlink path loss estimate, and the first pathloss compensation factor. Certainly, the first power control parametermay further include other parameters. This is not limited in theembodiments of this application.

Optionally, when the first carrier bandwidth part is used to send datacarried on a PUCCH, the first power control parameter may include acombination of at least any two of the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,and the first PUCCH format related power control parameter. Certainly,the first power control parameter may further include other parameters.This is not limited in the embodiments of this application.

It may be understood that if the power control parameter indicationinformation is used to indicate power control parameters correspondingto at least two carrier bandwidth parts, for an implementation of apower control parameter corresponding to each of the carrier bandwidthparts (for example, the second power control parameter corresponding tothe second carrier bandwidth part), refer to the implementations of thefirst power control parameter (it should be noted that the subscriptc,BWP1 of the identifiers corresponding to the first power controlparameter is modified into c,BWP2 or BWP2, corresponding to the secondcarrier bandwidth part). Details are not described herein again.

Optionally, for cumulative-type power adjustment of closed-loop powercontrol, an adjustment value of a PUSCH transmit power and/or an SRStransmit power of the terminal device is independently calculated oneach carrier bandwidth part. When an uplink carrier bandwidth part isswitched, the adjustment value of the transmit power is reset.

Optionally, the power control parameter indication information mayindicate, in at least the following several implementations, the firstpower control parameter corresponding to the first carrier bandwidthpart allocated by the network device to the terminal device on thecarrier.

In a first implementation, the power control parameter indicationinformation includes the first power control parameter. The first powercontrol parameter is used to indicate a first transmit power fortransmitting data on the first carrier bandwidth part.

Optionally, for an implementation of the first power control parameter,refer to the foregoing related content. Details are not described hereinagain.

In a second implementation, the power control parameter indicationinformation includes a reference power control parameter. The referencepower control parameter may include at least one power control parametercorresponding to a reference carrier bandwidth part, or the referencepower control parameter may include at least one power control parametercorresponding to a reference transmission parameter. Optionally, thereference carrier bandwidth part may be at least one of the following:bandwidth of the reference carrier bandwidth part, a subcarrier spacingof the reference carrier bandwidth part, and a CP type of the referencecarrier bandwidth part. Certainly, the reference carrier bandwidth partmay be alternatively another parameter. This is not limited in theembodiments of this application. Optionally, the reference transmissionparameter may include at least one of the following: referencebandwidth, a reference subcarrier spacing, and a reference CP type.Certainly, the reference transmission parameter may alternativelyinclude other transmission parameters. This is not limited in theembodiments of this application. Optionally, the reference carrierbandwidth part or the reference transmission parameter may bepredefined, or may be configured by the network device.

Certainly, the power control parameter indication information mayalternatively indicate, in other implementations, the first powercontrol parameter corresponding to the first carrier bandwidth partallocated by the network device to the terminal device. This is notlimited in the embodiments of this application.

Optionally, when the power control parameter indication information isused to indicate power control parameters corresponding to at least twocarrier bandwidth parts allocated by the network device to the terminaldevice, for a manner of indicating, by the power control parameterindication information, a power control parameter corresponding to acarrier bandwidth part, other than the first carrier bandwidth part (forexample, the second power control parameter corresponding to the secondcarrier bandwidth part), allocated by the network device to the terminaldevice, refer to the configuration manner of indicating, by the powercontrol parameter indication information, the first power controlparameter corresponding to the first carrier bandwidth part allocated bythe network device to the terminal device. Details are not describedherein again.

It should be noted that the configuration manner of the first powercontrol parameter corresponding to the first carrier bandwidth part andthe configuration manner of the second power control parametercorresponding to the second carrier bandwidth part may be the same ordifferent. For example, the configuration manner of the first powercontrol parameter corresponding to the first carrier bandwidth part maybe the foregoing first implementation, but the configuration manner ofthe second power control parameter corresponding to the second carrierbandwidth part may be the foregoing second implementation.Alternatively, the configuration manner of the first power controlparameter corresponding to the first carrier bandwidth part may be theforegoing second implementation, but the configuration manner of thesecond power control parameter corresponding to the second carrierbandwidth part may be the foregoing first implementation. Alternatively,both the configuration manner of the first power control parametercorresponding to the first carrier bandwidth part and the configurationmanner of the second power control parameter corresponding to the secondcarrier bandwidth part may be the foregoing first implementation or theforegoing second implementation.

Optionally, when the network device allocates a plurality of carrierbandwidth parts to the terminal device, for a configuration manner of apower control parameter corresponding to at least one of the pluralityof carrier bandwidth parts, refer to the configuration manner ofindicating, by the power control parameter indication information, thefirst power control parameter corresponding to the first carrierbandwidth part allocated by the network device to the terminal device.However, for a configuration manner of a power control parametercorresponding to a carrier bandwidth part, other than the at least onecarrier bandwidth part, in the plurality of carrier bandwidth parts,refer to the cell-specific or carrier-specific configuration manner inthe foregoing method. Details are not described herein again. Forexample, the configuration manner of the first power control parametercorresponding to the first carrier bandwidth part may be the foregoingfirst or second implementation, for the configuration manner of thesecond power control parameter corresponding to the second carrierbandwidth part, refer to the cell-specific or carrier-specificconfiguration manner in the foregoing method. Alternatively, theconfiguration manner of the second power control parameter correspondingto the second carrier bandwidth part may be the foregoing first orsecond implementation, for the configuration manner of the first powercontrol parameter corresponding to the first carrier bandwidth part,refer to the cell-specific or carrier-specific configuration manner inthe foregoing method.

Step S202: Receive the power control parameter indication information.

In this step, the terminal device receives the power control parameterindication information (used to indicate the power control parametercorresponding to each of the at least one carrier bandwidth partallocated by the network device to the terminal device) sent by thenetwork device, determines, based on the power control parameterindication information, the power control parameter corresponding to theat least one carrier bandwidth part, and further determines, based onthe power control parameter corresponding to each of the at least onecarrier bandwidth part, a corresponding transmit power for transmittingdata on each carrier bandwidth part.

For example, if the power control parameter indication information isused to indicate the power control parameter A corresponding to acarrier bandwidth part A, the terminal device determines, based on thepower control parameter indication information, the power controlparameter A corresponding to the carrier bandwidth part A, anddetermines, based on the power control parameter A, a correspondingtransmit power for transmitting data on the carrier bandwidth part A.For example, the carrier bandwidth part A may be the first carrierbandwidth part in the embodiments of this application, the correspondingpower control parameter A may be the first power control parameter, andthe corresponding transmit power may be the first transmit power, or thecarrier bandwidth part A may be the second carrier bandwidth part in theembodiments of this application, the corresponding power controlparameter A may be the second power control parameter, and thecorresponding transmit power may be a second transmit power.

For another example, if the power control parameter indicationinformation is used to indicate the first power control parametercorresponding to the first carrier bandwidth part and the second powercontrol parameter corresponding to the second carrier bandwidth part,the terminal device determines, based on the power control parameterindication information, the first power control parameter correspondingto the first carrier bandwidth part and the second power controlparameter corresponding to the second carrier bandwidth part, andfurther determines, based on the first power control parameter, thecorresponding first transmit power for transmitting data on the firstcarrier bandwidth part, and determines, based on the second powercontrol parameter, the corresponding second transmit power fortransmitting data on the second carrier bandwidth part.

Certainly, the power control parameter indication information may bealternatively used to indicate power control parameters corresponding toanother quantity of carrier bandwidth parts. Correspondingly, theterminal device determines, based on the power control parameterindication information, the power control parameter corresponding toeach of the carrier bandwidth parts, and further determinescorresponding transmit power for transmitting data on each of thecarrier bandwidth parts.

First, manners of determining, by the terminal device based on the powercontrol parameter indication information, the power control parametercorresponding to the at least one carrier bandwidth part are describedin detail.

The following part is described by using an example in which theterminal device determines, based on the power control parameterindication information (used to indicate the first power controlparameter corresponding to the first carrier bandwidth part), the firstpower control parameter corresponding to the first carrier bandwidthpart.

Optionally, the terminal device may determine, based on the powercontrol parameter indication information in at least the followingseveral implementations, the first power control parameter correspondingto the first carrier bandwidth part.

In a first implementation, if the power control parameter indicationinformation includes the first power control parameter (used to indicatethe first transmit power for transmitting data on the first carrierbandwidth part), the terminal device directly determines, based on thepower control parameter indication information, the first power controlparameter corresponding to the first carrier bandwidth part.

Optionally, for an implementation of the first power control parameter,refer to the related content in step S201. Details are not describedherein again.

In a second implementation, if the power control parameter indicationinformation includes the reference power control parameter, and thereference power control parameter may include at least one power controlparameter corresponding to the reference carrier bandwidth part, theterminal device determines the first power control parametercorresponding to the first carrier bandwidth part based on the referencepower control parameter, the reference carrier bandwidth part, and thefirst carrier bandwidth part.

Optionally, the determining, by the terminal device, the first powercontrol parameter corresponding to the first carrier bandwidth partbased on the reference power control parameter, the reference carrierbandwidth part, and the first carrier bandwidth part may include:determining, by the terminal device, the first power control parametercorresponding to the first carrier bandwidth part based on the referencepower control parameter, a transmission parameter of the referencecarrier bandwidth part, and a transmission parameter of the firstcarrier bandwidth part.

Optionally, the transmission parameter of the reference carrierbandwidth part may include the bandwidth of the reference carrierbandwidth part (for example, a quantity of RBs included in the referencecarrier bandwidth part), and the transmission parameter of the firstcarrier bandwidth part may include bandwidth of the first carrierbandwidth part (for example, a quantity of RBs included in the firstcarrier bandwidth part). Optionally, the transmission parameter of thereference carrier bandwidth part may include the subcarrier spacing ofthe reference carrier bandwidth part, and the transmission parameter ofthe first carrier bandwidth part may include a subcarrier spacing of thefirst carrier bandwidth part. Optionally, the transmission parameter ofthe reference carrier bandwidth part may include the CP type of thereference carrier bandwidth part, and the transmission parameter of thefirst carrier bandwidth part may include a CP type of the first carrierbandwidth part.

Optionally, the reference carrier bandwidth part may be an uplinkcarrier bandwidth part, or may be a downlink carrier bandwidth part.This is not limited in the embodiments of this application.

Optionally, the transmission parameter of the reference carrierbandwidth part in the foregoing embodiment may include a combination ofat least any two of the bandwidth of the reference carrier bandwidthpart, the subcarrier spacing of the reference carrier bandwidth part,and the CP type of the reference carrier bandwidth part.Correspondingly, the transmission parameter of the first carrierbandwidth part may also include a combination of at least two of thebandwidth of the first carrier bandwidth part, the subcarrier spacing ofthe first carrier bandwidth part, and the CP type of the first carrierbandwidth part. For example, if the transmission parameter of thereference carrier bandwidth part may include the bandwidth of thereference carrier bandwidth part and the subcarrier spacing of thereference carrier bandwidth part, the transmission parameter of thefirst carrier bandwidth part may also include the bandwidth of the firstcarrier bandwidth part and the subcarrier spacing of the first carrierbandwidth part. For another example, if the transmission parameter ofthe reference carrier bandwidth part may include the bandwidth of thereference carrier bandwidth part and the CP type of the referencecarrier bandwidth part, the transmission parameter of the first carrierbandwidth part may also include the bandwidth of the first carrierbandwidth part and the cyclic prefix type of the first carrier bandwidthpart. For another example, if the transmission parameter of thereference carrier bandwidth part may include the subcarrier spacing ofthe reference carrier bandwidth part and the CP type of the referencecarrier bandwidth part, the transmission parameter of the first carrierbandwidth part may also include the subcarrier spacing of the firstcarrier bandwidth part and the CP type of the first carrier bandwidthpart. For another example, if the transmission parameter of thereference carrier bandwidth part may include the bandwidth of thereference carrier bandwidth part, the subcarrier spacing of thereference carrier bandwidth part, and the CP type of the referencecarrier bandwidth part, the transmission parameter of the first carrierbandwidth part may also include the bandwidth of the first carrierbandwidth part, the subcarrier spacing of the first carrier bandwidthpart, and the CP type of the first carrier bandwidth part.

It should be noted that if the transmission parameter of the referencecarrier bandwidth part includes another type of transmission parameter,the transmission parameter of the first carrier bandwidth part may alsoinclude a corresponding transmission parameter. This is not limited inthe embodiments of this application.

Optionally, the first power control parameter may include the foregoingfirst open-loop power control parameter, and the reference power controlparameter in the foregoing embodiment may include a reference open-looppower control parameter. For example, when the first carrier bandwidthpart is used to send at least one of the SRS and the data carried on thePUSCH, the reference open-loop power control parameter may be areference receive power P_(O_PUSCH) expected by the network device, orthe reference open-loop power control parameter may be a PUSCH referencetransmit power P_(O_NOMINAL_PUSCH) that is expected by the networkdevice for normal demodulation and that is configured by using higherlayer signaling, and/or a reference power offset P_(O_UE_PUSCH),configured by using higher layer signaling, of the terminal devicerelative to P_(O_NOMINAL_PUSCH). For another example, when the firstcarrier bandwidth part is used to send the data carried on the PUCCH,the reference open-loop power control parameter may be a referencereceive power P_(O_PUCCH) expected by the network device, or thereference open-loop power control parameter may be a PUCCH referencetransmit power P_(O_NOMINAL_PUCCH) that is expected by the networkdevice for normal demodulation and that is configured by using higherlayer signaling, and/or a reference power offset P_(O_UE_PUCCH),configured by using higher layer signaling, of the terminal devicerelative to O_NOMINAL_PUCCH Optionally, the first power controlparameter may include the foregoing first closed-loop power controlparameter, and the reference power control parameter in the foregoingembodiment may include a reference closed-loop power control parameter.For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, the referenceclosed-loop power control parameter may be a reference adjustment valuef of the PUSCH transmit power of the terminal device, or the referenceclosed-loop power control parameter may be a reference power adjustmentvalue δ_(PUSCH) indicated by the TPC in the PDCCH, and/or a referenceinitial value (0) of the adjustment value of the PUSCH transmit powerand/or the SRS transmit power of the terminal device. For anotherexample, when the first carrier bandwidth part is used to send the datacarried on the PUCCH, the reference closed-loop power control parametermay be a reference adjustment value g for closed-loop power control ofthe terminal device, or the reference closed-loop power controlparameter may be a reference power adjustment value δ_(PUCCH) indicatedby the TPC in the PDCCH, and/or a reference initial value g(0) of theadjustment value of the PUCCH transmit power of the terminal device.

Optionally, the first power control parameter may include the foregoingfirst maximum transmit power parameter, and the reference power controlparameter in the foregoing embodiment may include a reference maximumtransmit power parameter, for example, P_(CMAX).

Optionally, the first power control parameter may include the foregoingfirst downlink path loss estimate, and the reference power controlparameter in the foregoing embodiment may include a reference downlinkpath loss estimate, for example, PL (used to indicate a referencedownlink path loss estimate that is estimated by the terminal device).

Optionally, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, the first powercontrol parameter may include the foregoing first path loss compensationfactor, and the reference power control parameter in the foregoingembodiment may include a reference path loss compensation factor, forexample, a (used to indicate a reference path loss compensation factorconfigured by using higher layer signaling).

Optionally, when the first carrier bandwidth part is used to send thedata carried on the PUCCH, the first power control parameter may includethe foregoing first PUCCH format related power control parameter, andthe reference power control parameter in the foregoing embodiment mayinclude a reference PUCCH format related power control parameter. Forexample, if the first PUCCH format related power control parameter isΔ_(F_PUCCH,c,BWP1)(F), the reference PUCCH format related power controlparameter may be a reference power control parameter Δ_(F_PUCCH)(F)determined based on the relative relationship between the used PUCCHformat and the PUCCH format 1a, if the first PUCCH format related powercontrol parameter is Δ_(TxD,c,BWP1)(F′), the reference PUCCH formatrelated power control parameter may be a reference transmit power offsetΔ_(TxD)(F′) configured by using higher layer signaling, or if the firstPUCCH format related power control parameter includesΔ_(F_PUCCH,c,BWP1)(F) and Δ_(TxD,c,BWP1)(F′), the reference PUCCH formatrelated power control parameter may include Δ_(F_PUCCH)(F) andΔ_(TxD)(F′).

Optionally, when the first carrier bandwidth part is used to send thedata carried on the PUSCH, the first power control parameter may includea combination of at least any two of the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,and the first path loss compensation factor, and the reference powercontrol parameter in the foregoing embodiment may correspondinglyinclude a combination of at least any two of the reference open-looppower control parameter, the reference closed-loop power controlparameter, the reference maximum transmit power parameter, the referencedownlink path loss estimate, and the reference path loss compensationfactor.

Optionally, when the first carrier bandwidth part is used to send theSRS, the first power control parameter may include a combination of atleast any two of the first open-loop power control parameter, the firstclosed-loop power control parameter, the first maximum transmit powerparameter, the first downlink path loss estimate, and the first pathloss compensation factor, and the reference power control parameter inthe foregoing embodiment may correspondingly include a combination of atleast any two of the reference open-loop power control parameter, thereference closed-loop power control parameter, the reference maximumtransmit power parameter, the reference downlink path loss estimate, andthe reference path loss compensation factor.

Optionally, when the first carrier bandwidth part is used to send thedata carried on the PUCCH, the first power control parameter may includea combination of at least any two of the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,and the first PUCCH format related power control parameter, and thereference power control parameter in the foregoing embodiment maycorrespondingly include a combination of at least any two of thereference open-loop power control parameter, the reference closed-looppower control parameter, the reference maximum transmit power parameter,the reference downlink path loss estimate, and the reference PUCCHformat related power control parameter.

It should be noted that if the first power control parameter includesanother type of power control parameter, the reference power controlparameter in the foregoing embodiment may also include a correspondingpower control parameter. This is not limited in the embodiments of thisapplication.

Optionally, the terminal device determines the first power controlparameter corresponding to the first carrier bandwidth part based on thereference power control parameter, the transmission parameter of thereference carrier bandwidth part, the transmission parameter of thefirst carrier bandwidth part, and first mapping information. The firstmapping information includes a mapping relationship between thetransmission parameter of the reference carrier bandwidth part, thetransmission parameter of the first carrier bandwidth part, and acompensation offset corresponding to at least one power controlparameter included in the reference power control parameter. Optionally,the first mapping information may be predefined, or may be configured bythe network device. Optionally, the first power control parameter isdetermined based on the reference power control parameter plus thecompensation offset.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is equal to the bandwidthof the reference carrier bandwidth, a value of a compensation offsetcorresponding to the reference open-loop power control parameter is 0,when the first carrier bandwidth part is used to send at least one ofthe SRS and the data carried on the PUSCH, and the bandwidth of thefirst carrier bandwidth part is less than the bandwidth of the referencecarrier bandwidth part, a value of a compensation offset correspondingto the reference open-loop power control parameter is a positive number,where the compensation offset may be determined based on a ratio or adifference between the bandwidth of the reference carrier bandwidth partand the bandwidth of the first carrier bandwidth part, or when the firstcarrier bandwidth part is used to send at least one of the SRS and thedata carried on the PUSCH, and the bandwidth of the first carrierbandwidth part is greater than the bandwidth of the reference carrierbandwidth part, a value of a compensation offset corresponding to thereference open-loop power control parameter is a negative number, wherethe compensation offset may be determined based on a ratio or adifference between the bandwidth of the reference carrier bandwidth partand the bandwidth of the first carrier bandwidth part, or the value ofthe compensation offset is 0.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is equal to thesubcarrier spacing of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference open-loop powercontrol parameter is 0, when the first carrier bandwidth part is used tosend at least one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is less than thesubcarrier spacing of the reference carrier bandwidth part, a value of acompensation offset corresponding to the reference open-loop powercontrol parameter is a negative number, where the compensation offsetmay be determined based on a ratio or a difference between thesubcarrier spacing of the reference carrier bandwidth part and thesubcarrier spacing of the first carrier bandwidth part, or the value ofthe compensation offset is 0, or when the first carrier bandwidth partis used to send at least one of the SRS and the data carried on thePUSCH, and the subcarrier spacing of the first carrier bandwidth part isgreater than the subcarrier spacing of the reference carrier bandwidthpart, a value of a compensation offset corresponding to the referenceopen-loop power control parameter is a positive number, where thecompensation offset may be determined based on a ratio or a differencebetween the subcarrier spacing of the reference carrier bandwidth partand the subcarrier spacing of the first carrier bandwidth part.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is equal to the bandwidthof the reference carrier bandwidth, a value of a compensation offsetcorresponding to the reference closed-loop power control parameter is 0,when the first carrier bandwidth part is used to send at least one ofthe SRS and the data carried on the PUSCH, and the bandwidth of thefirst carrier bandwidth part is less than the bandwidth of the referencecarrier bandwidth, a value of a compensation offset corresponding to thereference closed-loop power control parameter is a positive number,where the compensation offset may be determined based on a ratio or adifference between the bandwidth of the reference carrier bandwidth partand the bandwidth of the first carrier bandwidth part, or when the firstcarrier bandwidth part is used to send at least one of the SRS and thedata carried on the PUSCH, and the bandwidth of the first carrierbandwidth part is greater than the bandwidth of the reference carrierbandwidth, a value of a compensation offset corresponding to thereference closed-loop power control parameter is a negative number,where the compensation offset may be determined based on a ratio or adifference between the bandwidth of the reference carrier bandwidth partand the bandwidth of the first carrier bandwidth part, or the value ofthe compensation offset is 0.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is equal to thesubcarrier spacing of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference closed-loop powercontrol parameter is 0, when the first carrier bandwidth part is used tosend at least one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is less than thesubcarrier spacing of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference closed-loop powercontrol parameter is a negative number, where the compensation offsetmay be determined based on a ratio or a difference between thesubcarrier spacing of the reference carrier bandwidth part and thesubcarrier spacing of the first carrier bandwidth part, or the value ofthe compensation offset is 0, or when the first carrier bandwidth partis used to send at least one of the SRS and the data carried on thePUSCH, and the subcarrier spacing of the first carrier bandwidth part isgreater than the subcarrier spacing of the reference carrier bandwidth,a value of a compensation offset corresponding to the referenceclosed-loop power control parameter is a positive number, where thecompensation offset may be determined based on a ratio or a differencebetween the subcarrier spacing of the reference carrier bandwidth partand the subcarrier spacing of the first carrier bandwidth part.

For example, when the bandwidth of the first carrier bandwidth part isequal to the bandwidth of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference downlink path lossestimate is 0, when the bandwidth of the first carrier bandwidth part isless than the bandwidth of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference downlink path lossestimate is a positive number, where the compensation offset may bedetermined based on a ratio between the bandwidth of the referencecarrier bandwidth part and the bandwidth of the first carrier bandwidthpart, or when the bandwidth of the first carrier bandwidth part isgreater than the bandwidth of the reference carrier bandwidth, a valueof a compensation offset corresponding to the reference downlink pathloss estimate is a negative number, where the compensation offset may bedetermined based on a ratio between the bandwidth of the referencecarrier bandwidth part and the bandwidth of the first carrier bandwidthpart, or the value of the compensation offset is 0.

For example, when the subcarrier spacing of the first carrier bandwidthpart is equal to the subcarrier spacing of the reference carrierbandwidth, a value of a compensation offset corresponding to thereference downlink path loss estimate is 0, when the subcarrier spacingof the first carrier bandwidth part is less than the subcarrier spacingof the reference carrier bandwidth, a value of a compensation offsetcorresponding to the reference downlink path loss estimate is a negativenumber, where the compensation offset may be determined based on a ratioor a difference between the subcarrier spacing of the reference carrierbandwidth part and the subcarrier spacing of the first carrier bandwidthpart, or the value of the compensation offset is 0, or when thesubcarrier spacing of the first carrier bandwidth part is greater thanthe subcarrier spacing of the reference carrier bandwidth, a value of acompensation offset corresponding to the reference downlink path lossestimate is a positive number, where the compensation offset may bedetermined based on a ratio or a difference between the subcarrierspacing of the reference carrier bandwidth part and the subcarrierspacing of the first carrier bandwidth part.

It should be noted that when the transmission parameter of the firstcarrier bandwidth part includes another transmission parameter, and thetransmission parameter of the reference carrier bandwidth includes acorresponding transmission parameter, for a compensation offsetcorresponding to any power control parameter included in the referencepower control parameter, refer to the compensation offset correspondingto the reference open-loop power control parameter, the compensationoffset corresponding to the reference closed-loop power controlparameter, or the compensation offset corresponding to the referencedownlink path loss estimate. Examples are not described one by oneherein.

Optionally, the terminal device determines the first power controlparameter corresponding to the first carrier bandwidth part based on thereference power control parameter, the transmission parameter of thereference carrier bandwidth part, the transmission parameter of thefirst carrier bandwidth part, and second mapping information. The secondmapping information includes a mapping relationship between thetransmission parameter of the reference carrier bandwidth part, thetransmission parameter of the first carrier bandwidth part, and acompensation coefficient corresponding to at least one power controlparameter included in the reference power control parameter. Optionally,the second mapping information may be predefined, or may be configuredby the network device. Optionally, the first power control parameter isdetermined based on the reference power control parameter multiplied bythe compensation coefficient.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is equal to the bandwidthof the reference carrier bandwidth, a value of a compensationcoefficient corresponding to the reference open-loop power controlparameter is 1, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is less than the bandwidthof the reference carrier bandwidth part, a value of a compensationcoefficient corresponding to the reference open-loop power controlparameter is greater than 1, where the compensation coefficient may bedetermined based on a ratio or a difference between the bandwidth of thereference carrier bandwidth part and the bandwidth of the first carrierbandwidth part, or when the first carrier bandwidth part is used to sendat least one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is greater than thebandwidth of the reference carrier bandwidth part, a value of acompensation coefficient corresponding to the reference open-loop powercontrol parameter is less than 1, where the compensation coefficient maybe determined based on a ratio or a difference between the bandwidth ofthe reference carrier bandwidth part and the bandwidth of the firstcarrier bandwidth part, or the value of the compensation coefficient is1.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is equal to thesubcarrier spacing of the reference carrier bandwidth part, a value of acompensation coefficient corresponding to the reference open-loop powercontrol parameter is 1, when the first carrier bandwidth part is used tosend at least one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is smaller thanthe subcarrier spacing of the reference carrier bandwidth part, a valueof a compensation coefficient corresponding to the reference open-looppower control parameter is less than 1, where the compensationcoefficient may be determined based on a ratio or a difference betweenthe subcarrier spacing of the reference carrier bandwidth part and thesubcarrier spacing of the first carrier bandwidth part, or the value ofthe compensation coefficient is 1, or when the first carrier bandwidthpart is used to send at least one of the SRS and the data carried on thePUSCH, and the subcarrier spacing of the first carrier bandwidth part isgreater than the subcarrier spacing of the reference carrier bandwidthpart, a value of a compensation coefficient corresponding to thereference open-loop power control parameter is greater than 1, where thecompensation coefficient may be determined based on a ratio or adifference between the subcarrier spacing of the reference carrierbandwidth part and the subcarrier spacing of the first carrier bandwidthpart.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is equal to the bandwidthof the reference carrier bandwidth, a value of a compensationcoefficient corresponding to the reference closed-loop power controlparameter is 1, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thebandwidth of the first carrier bandwidth part is less than the bandwidthof the reference carrier bandwidth, a value of a compensationcoefficient corresponding to the reference closed-loop power controlparameter is greater than 1, where the compensation coefficient may bedetermined based on a ratio between the bandwidth of the referencecarrier bandwidth part and the bandwidth of the first carrier bandwidthpart, or when the first carrier bandwidth part is used to send at leastone of the SRS and the data carried on the PUSCH, and the bandwidth ofthe first carrier bandwidth part is greater than the bandwidth of thereference carrier bandwidth, a value of a compensation coefficientcorresponding to the reference closed-loop power control parameter isless than 1, where the compensation coefficient may be determined basedon a ratio between the bandwidth of the reference carrier bandwidth partand the bandwidth of the first carrier bandwidth part, or the value ofthe compensation coefficient is 1.

For example, when the first carrier bandwidth part is used to send atleast one of the SRS and the data carried on the PUSCH, and thesubcarrier spacing of the first carrier bandwidth part is equal to thesubcarrier spacing of the reference carrier bandwidth part, a value of acompensation coefficient corresponding to the reference closed-looppower control parameter is 1, when the first carrier bandwidth part isused to send at least one of the SRS and the data carried on the PUSCH,and the subcarrier spacing of the first carrier bandwidth part is lessthan the subcarrier spacing of the reference carrier bandwidth part, avalue of a compensation coefficient corresponding to the referenceclosed-loop power control parameter is less than 1, where thecompensation coefficient may be determined based on a ratio or adifference between the subcarrier spacing of the reference carrierbandwidth part and the subcarrier spacing of the first carrier bandwidthpart, or the value of the compensation coefficient is 1, or when thefirst carrier bandwidth part is used to send at least one of the SRS andthe data carried on the PUSCH, and the subcarrier spacing of the firstcarrier bandwidth part is greater than the subcarrier spacing of thereference carrier bandwidth part, a value of a compensation coefficientcorresponding to the reference closed-loop power control parameter isgreater than 1, where the compensation coefficient may be determinedbased on a ratio or a difference between the subcarrier spacing of thereference carrier bandwidth part and the subcarrier spacing of the firstcarrier bandwidth part.

For example, when the bandwidth of the first carrier bandwidth part isequal to the bandwidth of the reference carrier bandwidth, a value of acompensation coefficient corresponding to the reference downlink pathloss estimate is 1, when the bandwidth of the first carrier bandwidthpart is less than the bandwidth of the reference carrier bandwidth part,a value of a compensation coefficient corresponding to the referencedownlink path loss estimate is greater than 1, where the compensationcoefficient may be determined based on a ratio between the bandwidth ofthe reference carrier bandwidth part and the bandwidth of the firstcarrier bandwidth part, or when the bandwidth of the first carrierbandwidth part is greater than the bandwidth of the reference carrierbandwidth part, a value of a compensation coefficient corresponding tothe reference downlink path loss estimate is less than 1, where thecompensation coefficient may be determined based on a ratio between thebandwidth of the reference carrier bandwidth part and the bandwidth ofthe first carrier bandwidth part, or the value of the compensationcoefficient is 1.

For example, when the subcarrier spacing of the first carrier bandwidthpart is equal to the subcarrier spacing of the reference carrierbandwidth part, a value of a compensation coefficient corresponding tothe reference downlink path loss estimate is 1, when the subcarrierspacing of the first carrier bandwidth part is less than the subcarrierspacing of the reference carrier bandwidth part, a value of acompensation coefficient corresponding to the reference downlink pathloss estimate is less than 1, where the compensation coefficient may bedetermined based on a ratio or a difference between the subcarrierspacing of the reference carrier bandwidth part and the subcarrierspacing of the first carrier bandwidth part, or the value of thecompensation coefficient is 1, or when the subcarrier spacing of thefirst carrier bandwidth part is greater than the subcarrier spacing ofthe reference carrier bandwidth part, a value of a compensationcoefficient corresponding to the reference downlink path loss estimateis greater than 1, where the compensation coefficient may be determinedbased on a ratio or a difference between the subcarrier spacing of thereference carrier bandwidth part and the subcarrier spacing of the firstcarrier bandwidth part.

It should be noted that when the transmission parameter of the firstcarrier bandwidth part includes another transmission parameter, and thetransmission parameter of the reference carrier bandwidth includes acorresponding transmission parameter, for a compensation coefficientcorresponding to any power control parameter included in the referencepower control parameter, refer to the compensation coefficientcorresponding to the reference open-loop power control parameter, thecompensation coefficient corresponding to the reference closed-looppower control parameter, or the compensation coefficient correspondingto the reference downlink path loss estimate. Examples are not describedone by one herein.

Certainly, the terminal device may alternatively determine, in anotherpossible implementation, the first power control parameter correspondingto the first carrier bandwidth part based on the reference power controlparameter, the transmission parameter corresponding to the referencecarrier bandwidth part, and the transmission parameter of the firstcarrier bandwidth part. This is not limited in this embodiment of thisapplication.

In a third implementation, if the power control parameter indicationinformation includes the reference power control parameter, and thereference power control parameter may include at least one power controlparameter corresponding to the reference transmission parameter, theterminal device determines the first power control parametercorresponding to the first carrier bandwidth part based on the referencepower control parameter, the reference transmission parameter, and thetransmission parameter of the first carrier bandwidth part.

For an implementation of the reference transmission parameter in thisembodiment of this application, refer to the implementations of thetransmission parameter of the reference carrier bandwidth part in theforegoing descriptions. Details are not described herein again.

For an implementation of the transmission parameter of the first carrierbandwidth part in this embodiment of this application, refer to theimplementations of the transmission parameter of the first carrierbandwidth part in the foregoing descriptions. Details are not describedherein again.

For an implementation of the first power control parameter and/or thereference power control parameter in this embodiment of thisapplication, refer to the foregoing related content. Details are notdescribed herein again.

Optionally, the terminal device determines the first power controlparameter corresponding to the first carrier bandwidth part based on thereference power control parameter, the reference transmission parameter,the transmission parameter of the first carrier bandwidth part, andthird mapping information. The third mapping information includes amapping relationship between the reference transmission parameter, thetransmission parameter of the first carrier bandwidth part, and acompensation offset corresponding to at least one power controlparameter included in the reference power control parameter. Optionally,the third mapping information may be predefined, or may be configured bythe network device.

For a compensation offset corresponding to any power control parameterincluded in the reference power control parameter in this embodiment ofthis application, refer to the compensation offset corresponding to thereference open-loop power control parameter, the compensation offsetcorresponding to the reference closed-loop power control parameter, orthe compensation offset corresponding to the reference downlink pathloss estimate in the foregoing descriptions. Details are not describedherein again.

Optionally, the terminal device determines the first power controlparameter corresponding to the first carrier bandwidth part based on thereference power control parameter, the reference transmission parameter,the transmission parameter of the first carrier bandwidth part, andfourth mapping information. The fourth mapping information includes amapping relationship between the reference transmission parameter, thetransmission parameter of the first carrier bandwidth part, and acompensation coefficient corresponding to at least one power controlparameter included in the reference power control parameter. Optionally,the fourth mapping information may be predefined, or may be configuredby the network device.

For a compensation coefficient corresponding to any power controlparameter included in the reference power control parameter in thisembodiment of this application, refer to the compensation coefficientcorresponding to the reference open-loop power control parameter, thecompensation coefficient corresponding to the reference closed-looppower control parameter, or the compensation coefficient correspondingto the reference downlink path loss estimate in the foregoingdescriptions. Details are not described herein again.

Certainly, the terminal device may alternatively determine, in anotherpossible implementation, the first power control parameter correspondingto the first carrier bandwidth part based on the reference power controlparameter, the reference transmission parameter, and the transmissionparameter of the first carrier bandwidth part. This is not limited inthis embodiment of this application.

In this embodiment, when the power control parameter indicationinformation is used to indicate the second power control parametercorresponding to the second carrier bandwidth part allocated by thenetwork device to the terminal device, for a manner of determining, bythe terminal device based on the power control parameter indicationinformation, the second power control parameter corresponding to thesecond carrier bandwidth part, refer to the foregoing manners of“determining, based on the power control parameter indicationinformation, the first power control parameter corresponding to thefirst carrier bandwidth part”. Details are not described herein again.

Optionally, the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter in the foregoingembodiment may include the reference bandwidth (for example, thequantity of RBs included in the reference carrier bandwidth part), and atransmission parameter of the second carrier bandwidth part may includesecond bandwidth of the second carrier bandwidth part (for example, aquantity of RBs included in the second carrier bandwidth part).

Optionally, the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter in the foregoingembodiment may include the reference subcarrier spacing, and atransmission parameter of the second carrier bandwidth part may includea second subcarrier spacing of the second carrier bandwidth part.

Optionally, the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter in the foregoingembodiment may include the reference cyclic prefix (CP) type, and atransmission parameter of the second carrier bandwidth part may includea second cyclic prefix type of the second carrier bandwidth part.

Optionally, the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter in the foregoingembodiment may include a combination of any two of the referencebandwidth, the reference subcarrier spacing, and the reference cyclicprefix type. Correspondingly, the transmission parameter of the secondcarrier bandwidth part may also include a combination of any two of thesecond bandwidth, the second subcarrier spacing, and the second cyclicprefix type. For example, if the transmission parameter of the referencecarrier bandwidth part or the reference transmission parameter mayinclude the reference bandwidth and the reference subcarrier spacing,the transmission parameter of the second carrier bandwidth part may alsoinclude the second bandwidth and the second subcarrier spacing. Foranother example, if the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter may include thereference bandwidth and the reference cyclic prefix type, thetransmission parameter of the second carrier bandwidth part may alsoinclude the second bandwidth and the second cyclic prefix type. Foranother example, if the transmission parameter of the reference carrierbandwidth part or the reference transmission parameter may include thereference subcarrier spacing and the reference cyclic prefix type, thetransmission parameter of the second carrier bandwidth part may alsoinclude the second subcarrier spacing and the second cyclic prefix type.For another example, if the transmission parameter of the referencecarrier bandwidth part or the reference transmission parameter mayinclude the reference bandwidth, the reference subcarrier spacing, andthe reference cyclic prefix type, the transmission parameter of thesecond carrier bandwidth part may also include the second bandwidth, thesecond subcarrier spacing, and the second cyclic prefix type.

It should be noted that if the transmission parameter of the referencecarrier bandwidth part or the reference transmission parameter includesanother type of transmission parameter, the transmission parameter ofthe second carrier bandwidth part may also include a correspondingtransmission parameter. This is not limited in the embodiments of thisapplication.

Optionally, the second power control parameter may include a secondopen-loop power control parameter, and the reference power controlparameter in the foregoing embodiment may include the referenceopen-loop power control parameter.

Optionally, the second power control parameter may include a secondclosed-loop power control parameter, and the reference power controlparameter in the foregoing embodiment may include the referenceclosed-loop power control parameter.

Optionally, the second power control parameter may include a secondmaximum transmit power parameter, and the reference power controlparameter in the foregoing embodiment may include the reference maximumtransmit power parameter.

Optionally, the second power control parameter may include a seconddownlink path loss estimate, and the reference power control parameterin the foregoing embodiment may include the reference downlink path lossestimate.

Optionally, when the second carrier bandwidth part is used to send atleast one of an SRS and data carried on a PUSCH, the second powercontrol parameter may include a second path loss compensation factor,the reference power control parameter in the foregoing embodiment mayinclude the reference path loss compensation factor.

Optionally, when the second carrier bandwidth part is used to send datacarried on a PUCCH, the second power control parameter may include thesecond PUCCH format related power control parameter, and the referencepower control parameter in the foregoing embodiment may include thereference PUCCH format related power control parameter. For example, ifthe second PUCCH format related power control parameter isΔ_(F_PUCCH,c,BWP2)(F), the reference PUCCH format related power controlparameter may be Δ_(F_PUCCH)(F), if the second PUCCH format relatedpower control parameter is Δ_(TxD,c,BWP2)(F′) the reference PUCCH formatrelated power control parameter may be Δ_(TxD)(F′), or if the secondPUCCH format related power control parameter includesΔ_(F_PUCCH,c,BwP2)(F) and Δ_(TxD,c,BWP2)(F′), the reference PUCCH formatrelated power control parameter may include Δ_(F_PUCCH)(F) andΔ_(TxD)(F′).

Optionally, when the second carrier bandwidth part is used to send datacarried on a PUSCH, the second power control parameter may include acombination of at least any two of the second open-loop power controlparameter, the second closed-loop power control parameter, the secondmaximum transmit power parameter, the second downlink path lossestimate, and the second path loss compensation factor, and thereference power control parameter in the foregoing embodiment maycorrespondingly include a combination of at least any two of thereference open-loop power control parameter, the reference closed-looppower control parameter, the reference maximum transmit power parameter,the reference downlink path loss estimate, and the reference path losscompensation factor.

Optionally, when the second carrier bandwidth part is used to send anSRS, the second power control parameter may include a combination of atleast any two of the second open-loop power control parameter, thesecond closed-loop power control parameter, the second maximum transmitpower parameter, the second downlink path loss estimate, and the secondpath loss compensation factor, and the reference power control parameterin the foregoing embodiment may correspondingly include a combination ofat least any two of the reference open-loop power control parameter, thereference closed-loop power control parameter, the reference maximumtransmit power parameter, the reference downlink path loss estimate, andthe reference path loss compensation factor.

Optionally, when the second carrier bandwidth part is used to send datacarried on a PUCCH, the second power control parameter may include acombination of at least any two of the second open-loop power controlparameter, the second closed-loop power control parameter, the secondmaximum transmit power parameter, the second downlink path lossestimate, and the second PUCCH format related power control parameter,and the reference power control parameter in the foregoing embodimentmay correspondingly include a combination of at least any two of thereference open-loop power control parameter, the reference closed-looppower control parameter, the reference maximum transmit power parameter,the reference downlink path loss estimate, and the reference PUCCHformat related power control parameter.

It should be noted that if the second power control parameter includesanother type of power control parameter, the reference power controlparameter in the foregoing embodiment may also include a correspondingpower control parameter. This is not limited in this embodiment of thisapplication.

In this embodiment, when the power control parameter indicationinformation is used to indicate power control parameters correspondingto at least two carrier bandwidth parts allocated by the network deviceto the terminal device, for a manner of determining, by the terminaldevice based on the power control parameter indication information, apower control parameter corresponding to each of the carrier bandwidthparts, refer to the foregoing manners of “determining, based on thepower control parameter indication information, the first power controlparameter corresponding to the first carrier bandwidth part”. Detailsare not described herein again.

Next, a manner of determining, by the terminal device based on the powercontrol parameter corresponding to each of the at least one carrierbandwidth part, the corresponding transmit power for transmitting dataon each carrier bandwidth part is described in detail.

The following part is described by using an example in which theterminal device determines, based on the first power control parameter,the corresponding first transmit power for transmitting data on thefirst carrier bandwidth part.

When the first carrier bandwidth part is used to send the data carriedon the PUSCH, the terminal device substitutes the determined first powercontrol parameter for a corresponding power control parameter in theforegoing formula (1) to determine the first transmit power. Forexample, when the first power control parameter includes the firstopen-loop power control parameter (for example, P_(O_PUSCH,c,BWP1)), theterminal device substitutes the first open-loop power control parameter(P_(O_PUSCH,c,BWP1)) for P_(O_PUSCH,c) in the foregoing formula (1) todetermine the first transmit power. For another example, when the firstpower control parameter includes the first open-loop power controlparameter (for example, P_(O_PUSCH,c,BWP1)) and the first path losscompensation factor (for example, α_(c,BWP1)), the terminal devicesubstitutes the first open-loop power control parameter(P_(O_PUSCH,c,BWP1)) for P_(O_PUSCH,c) in the foregoing formula (1) andsubstitutes the first path loss compensation factor (α_(c,BWP1)) for cin the foregoing formula (1) to determine the first transmit power. Itmay be understood that when the first power control parameter includesanother power control parameter, the another power control parameter iscorrespondingly substituted for a corresponding power control parameterin the foregoing formula (1) to determine the first transmit power.Examples are not described one by one herein.

When the first carrier bandwidth part is used to send the data carriedon the PUCCH, the terminal device substitutes the determined first powercontrol parameter for a corresponding power control parameter in theforegoing formula (3) to determine the first transmit power. Forexample, when the first power control parameter includes the firstopen-loop power control parameter (for example, P_(O_PUCCH,c,BWP1)), theterminal device substitutes the first open-loop power control parameter(P_(O_PUCCH,c,BWP1)) for P_(O_PUCCH,c) in the foregoing formula (3) todetermine the first transmit power. For another example, when the firstpower control parameter includes the first open-loop power controlparameter (for example, P_(O_PUCCH,c,BWP1)) and the first downlink pathloss estimate (for example, PL_(c,BWP1)), the terminal devicesubstitutes the first open-loop power control parameter(P_(O_PUCCH,c,BWP1)) for P_(O_PUCCH,c) in the foregoing formula (3) andsubstitutes the first downlink path loss estimate (PL_(c,BWP1)) forPL_(c) in the foregoing formula (3) to determine the first transmitpower. It may be understood that when the first power control parameterincludes another power control parameter, the another power controlparameter is correspondingly substituted for a corresponding powercontrol parameter in the foregoing formula (3) to determine the firsttransmit power. Examples are not described one by one herein.

When the first carrier bandwidth part is used to send the SRS, theterminal device substitutes the determined first power control parameterfor a corresponding power control parameter in the foregoing formula (4)to determine the first transmit power. For example, when the first powercontrol parameter includes the first open-loop power control parameter(for example, P_(O_PUSCH,c,BWP1)), the terminal device substitutes thefirst open-loop power control parameter (for example,P_(O_PUSCH,c,BWP1)) for P_(O_PUSCH,c) in the foregoing formula (4) todetermine the first transmit power. For another example, when the firstpower control parameter includes the first open-loop power controlparameter (for example, P_(O_PUSCH,c,BWP1)) and the first path losscompensation factor (for example, α_(c,BWP1)), the terminal devicesubstitutes the first open-loop power control parameter (for example,P_(O_PUSCH,c,BWP1)) for P_(O_PUSCH,c) in the foregoing formula (4) andsubstitutes the first path loss compensation factor (for example,α_(c,BWP1)) for c in the foregoing formula (4) to determine the firsttransmit power. It may be understood that when the first power controlparameter includes another power control parameter, the another powercontrol parameter is correspondingly substituted for a correspondingpower control parameter in the foregoing formula (4) to determine thefirst transmit power. Examples are not described one by one herein.

It should be noted that for a manner of determining, by the terminaldevice based on a power control parameter corresponding to any carrierbandwidth part, a corresponding transmit power for transmitting data onthe carrier bandwidth part, refer to the foregoing manners of“determining, by the terminal device based on the first power controlparameter, the corresponding first transmit power for transmitting dataon the first carrier bandwidth part”. Details are not described hereinagain.

Step S203: A terminal sends first uplink information on a first carrierbandwidth part based on a first transmit power, and/or sends seconduplink information on a second carrier bandwidth part based on a secondtransmit power.

The first transmit power is determined based on the first power controlparameter, and the first power control parameter is determined based onthe power control parameter indication information. The second transmitpower is determined based on the second power control parameter, and thesecond power control parameter is determined based on the power controlparameter indication information.

In this step, the terminal device determines, based on the power controlparameter indication information (used to indicate a power controlparameter corresponding to each of at least one carrier bandwidth partallocated by the network device to the terminal device), the powercontrol parameter corresponding to the at least one carrier bandwidthpart, determines, based on the power control parameter corresponding toeach of the at least one carrier bandwidth part, a correspondingtransmit power for transmitting data on each carrier bandwidth part, andthen sends uplink information on each carrier bandwidth part based onthe corresponding transmit power.

For example, if the power control parameter indication information isused to indicate a power control parameter A corresponding to a carrierbandwidth part A, the terminal device determines, based on the powercontrol parameter indication information, the power control parameter Acorresponding to the carrier bandwidth part A, determines, based on thepower control parameter A, a transmit power for transmitting data on thecarrier bandwidth part A, and then sends uplink information on thecarrier bandwidth part A based on the transmit power. The carrierbandwidth part A may be the first carrier bandwidth part in theembodiments of this application, the corresponding power controlparameter A may be the first power control parameter, and thecorresponding transmit power may be the first transmit power.Alternatively, the carrier bandwidth part A may be the second carrierbandwidth part in this embodiment of this application, the correspondingpower control parameter A may be the second power control parameter, andthe corresponding transmit power may be the second transmit power.

For another example, if the power control parameter indicationinformation is used to indicate the first power control parametercorresponding to the first carrier bandwidth part and the second powercontrol parameter corresponding to the second carrier bandwidth part,the terminal device determines, based on the power control parameterindication information, the first power control parameter correspondingto the first carrier bandwidth part and the second power controlparameter corresponding to the second carrier bandwidth part,determines, based on the first power control parameter, thecorresponding first transmit power for transmitting data on the firstcarrier bandwidth part, and determines, based on the second powercontrol parameter, the corresponding second transmit power fortransmitting data on the second carrier bandwidth part, and then sendsthe first uplink information on the first carrier bandwidth part basedon the first transmit power, and sends the second uplink information onthe second carrier bandwidth part based on the second transmit power.

Certainly, the power control parameter indication information may bealternatively used to indicate power control parameters corresponding toanother quantity of carrier bandwidth parts. Correspondingly, theterminal device determines, based on the power control parameterindication information, the power control parameters corresponding tothe carrier bandwidth parts, determines corresponding transmit powersfor transmitting data on the carrier bandwidth parts, and then sendsuplink information on each carrier bandwidth part based on acorresponding transmit power.

Step S204: The network device receives the first uplink information onthe first carrier bandwidth part, and/or receives the second uplinkinformation on the second carrier bandwidth part.

If the power control parameter indication information is used toindicate the power control parameter corresponding to each of the atleast one carrier bandwidth part allocated by the network device to theterminal device, the network device receives, on each carrier bandwidthpart, uplink information sent by the terminal device.

For example, if the power control parameter indication information isused to indicate the power control parameter A corresponding to thecarrier bandwidth part A, the network device receives uplink informationon the carrier bandwidth part A. For example, the carrier bandwidth partA may be the first carrier bandwidth part in the embodiments of thisapplication, and the corresponding uplink information may be the firstuplink information. Alternatively, the carrier bandwidth part A may bethe second carrier bandwidth part in the embodiments of thisapplication, and the corresponding uplink information may be the seconduplink information.

For another example, if the power control parameter indicationinformation is used to indicate the first power control parametercorresponding to the first carrier bandwidth part and the second powercontrol parameter corresponding to the second carrier bandwidth part,the network device receives the first uplink information on the firstcarrier bandwidth part, and receives the second uplink information onthe second carrier bandwidth part. A transmit power of the first uplinkinformation is the first transmit power, and a transmit power of thesecond uplink information is the second transmit power.

Certainly, the power control parameter indication information may bealternatively used to indicate power control parameters corresponding toanother quantity of carrier bandwidth parts. Correspondingly, thenetwork device receives, on each carrier bandwidth part, uplinkinformation sent by the terminal device.

In the embodiments of this application, the network device sends thepower control parameter indication information to the terminal device,so that the terminal device determines, based on the received powercontrol parameter indication information, the first power controlparameter corresponding to the first carrier bandwidth part and thesecond power control parameter corresponding to the second carrierbandwidth part. Further, the terminal device sends the first uplinkinformation to the network device on the first carrier bandwidth partbased on the first transmit power (determined based on the first powercontrol parameter), and sends the second uplink information to thenetwork device on the second carrier bandwidth part based on the secondtransmit power (determined based on the second power control parameter).It can be learned that the network device configures different powercontrol parameters for the terminal device based on different carrierbandwidth parts, so that the terminal device may send information ondifferent carrier bandwidth parts of a same carrier by using differenttransmit powers, thereby ensuring uplink signal quality (or uplinkcoverage) during carrier bandwidth part switching.

Usually, different PUCCH formats are used for PUCCH valid payloads withdifferent sizes. A valid payload is a quantity of information bitscarried on a PUCCH. Different PUCCH formats are corresponding todifferent modulation and coding schemes. For example, a PUCCH format 4or a PUCCH format 5 is used for a relatively large PUCCH valid payload,and a PUCCH format 1 or a PUCCH format 2 is used for a relatively smallPUCCH valid payload.

The PUCCH format 1 or the PUCCH format 2 carries a relatively smallPUCCH valid payload, and has a relatively strong orthogonal multiplexingcapability, that is, allows a relatively large quantity of users to usedifferent cyclic shifts to send respective PUCCHs in a same RB.Therefore, when a frequency diversity gain deteriorates, a frequencydiversity gain may be obtained by reducing multiplexing. Therefore, thePUCCH format 1 or the PUCCH format 2 is insensitive to deterioration ofthe frequency diversity gain, and power compensation may not need to beperformed during carrier bandwidth part switching. However, the PUCCHformat 4 or the PUCCH format 5 carries a relatively large PUCCH validpayload, and has a relatively weak orthogonal multiplexing capability.Therefore, the PUCCH format 4 or the PUCCH format 5 is sensitive todeterioration of a frequency diversity gain, and power compensationneeds to be performed during carrier bandwidth part switching.

When each carrier bandwidth part in the foregoing embodiment is used tosend data carried on a PUCCH, a PUCCH format is not limited (that is,the PUCCH format may be any PUCCH format). Based on the foregoingembodiment, the configuration manner of the first power controlparameter is described in this embodiment by using an example in whichthe first uplink information includes data carried on a first PUCCH(that is, the first carrier bandwidth part is used to send the datacarried on the first PUCCH).

Optionally, the first uplink information includes the data carried onthe first PUCCH, a PUCCH format of the first PUCCH is a first presetPUCCH format, and the first preset PUCCH format is some or all of firstavailable PUCCH formats. Optionally, the first available PUCCH formatsmay include but are not limited to at least one of the followingformats: a PUCCH format 0, the PUCCH format 1, . . . , and the PUCCHformat 5.

In this embodiment, when the first carrier bandwidth part is used tosend the data carried on the first PUCCH, the first power controlparameter may be configured in at least the following implementations.

In a first implementation, when the first preset PUCCH format is some ofthe first available PUCCH formats (for example, the PUCCH format 4 orthe PUCCH format 5), and the PUCCH format of the first PUCCH is thefirst preset PUCCH format, the network device may allocate the firstpower control parameter to the terminal device in the configurationmanner, specific to a carrier bandwidth part, provided in the foregoingembodiment. For example, the first power control parameter may includeat least one of the following: the first open-loop power controlparameter (for example, P_(O_PUCCH,c,BWP1), orP_(O_NOMINAL_PUCCH,c,BWP1) and/or P_(O_UE_PUCCH,c,BWP1)), the firstclosed-loop power control parameter (for example, δ_(PUCCH,c,BWP1)and/or g_(c,BWP1)(0)), the first PUCCH format related power controlparameter (for example, Δ_(F_PUCCH,c,BWP1)(F) and/orΔ_(TxD,c,BWP1)(F′)), the first maximum transmit power parameter (forexample, P_(CMAX,c,BWP1)), and the first downlink path loss estimate(for example, PL_(c,BWP1)) Certainly, the first power control parametermay further include another parameter. This is not limited in thisembodiment of this application.

In a second implementation, when the first preset PUCCH format is someof the first available PUCCH formats (for example, the PUCCH format 4 orthe PUCCH format 5), and the PUCCH format of the first PUCCH is a PUCCHformat (for example, the PUCCH format 1 or the PUCCH format 2) in thefirst available PUCCH formats other than the first preset PUCCH format,the network device may allocate the first power control parameter to theterminal device in the configuration manner specific to a cell or acarrier in the foregoing method. For example, the first power controlparameter may include at least one of the following: the first open-looppower control parameter (for example, P_(O_PUCCH,c,BWP1), orP_(O_NOMINAL_PUCCH,c,BWP1) and/or P_(O_UE_PUCCH,c,BWP1)), the firstclosed-loop power control parameter (for example, δ_(PUCCH,c,BWP1)and/or g_(c,BWP1)(0)), the first PUCCH format related power controlparameter (for example, Δ_(F_PUCCH,c,BWP1)(F) and/orΔ_(TxD,c,BWP1)(F′)), the first maximum transmit power parameter (forexample, P_(CMAX,c,BWP1)), and the first downlink path loss estimate(for example, PL_(c,BWP1)).

In a third implementation, when the first preset PUCCH format is all ofthe first available PUCCH formats, the network device may allocate thefirst power control parameter to the terminal device in theconfiguration manner, specific to a carrier bandwidth part, provided inthe foregoing embodiment.

Certainly, the first power control parameter may be alternativelyconfigured in another implementation. This is not limited in thisembodiment of this application.

Optionally, when a power control parameter that is corresponding to eachcarrier bandwidth part and that the power control parameter indicationinformation is used to indicate includes the power control parametercorresponding to the second carrier bandwidth part, the second uplinkinformation includes data carried on a second PUCCH, a PUCCH format ofthe second PUCCH is a second preset PUCCH format, and the second presetPUCCH format is some or all of second available PUCCH formats.Optionally, the second available PUCCH formats may include but are notlimited to at least one of the following formats: the PUCCH format 0,the PUCCH format 1, . . . , and the PUCCH format 5.

In this embodiment, when the second carrier bandwidth part is used tosend the data carried on the second PUCCH, the second power controlparameter may be configured in at least the following implementations.

In a first implementation, when the second preset PUCCH format is someof the second available PUCCH formats (for example, the PUCCH format 4or the PUCCH format 5), and the PUCCH format of the second PUCCH is thesecond preset PUCCH format, the network device may allocate the secondpower control parameter to the terminal device in the configurationmanner, specific to a carrier bandwidth part, provided in the foregoingembodiment. For example, the second power control parameter may includeat least one of the following: the second open-loop power controlparameter (for example, P_(O_PUCCH,c,BWP2), orP_(O_NOMINAL_PUCCH,c,BWP2) and/or P_(O_UE_PUCCH,c,BWP2)), the secondclosed-loop power control parameter (for example, δ_(PUCCH,c,BWP2)and/or g_(c,BWP2)(0), the second PUCCH format related power controlparameter (for example, Δ_(F_PUCCH,c,BWP2)(F) and/orΔ_(TxD,c,BWP2)(F′)), the second maximum transmit power parameter (forexample, P_(CMAX,c,BWP2)(i), and the second downlink path loss estimate(for example, PL_(c,BWP2)) Certainly, the second power control parametermay further include another parameter. This is not limited in thisembodiment of this application.

In a second implementation, when the second preset PUCCH format is someof the second available PUCCH formats (for example, the PUCCH format 4or the PUCCH format 5), and the PUCCH format of the second PUCCH is aPUCCH format (for example, the PUCCH format 1 or the PUCCH format 2) inthe second available PUCCH formats other than the second preset PUCCHformat, the network device may allocate the second power controlparameter to the terminal device in the configuration manner specific toa cell or a carrier in the foregoing method. For example, the secondpower control parameter may include at least one of the following: thesecond open-loop power control parameter (for example,P_(O_PUCCH,c,BWP2),or P_(O_NOMINAL_PUCCH,c,BWP2) and/orP_(O_UE_PUCCH,c,BWP2)), the second closed-loop power control parameter(for example, δ_(PUCCH,c,BWP2) and/or g_(c,BWP2)(0), the second PUCCHformat related power control parameter (for example,Δ_(F_PUCCH,c,BWP2)(F) and/or Δ_(TxD,c,BWP2)(F′)), the second maximumtransmit power parameter (for example, P_(CMAX,c,BWP2))), and the seconddownlink path loss estimate (for example, PL_(c,BWP2)).

In a third implementation, when the second preset PUCCH format is all ofthe second available PUCCH formats, the network device may allocate thesecond power control parameter to the terminal device in theconfiguration manner, specific to a carrier bandwidth part, provided inthe foregoing embodiment.

Certainly, the second power control parameter may be alternativelyconfigured in another implementation. This is not limited in thisembodiment of this application.

It should be noted that when the power control parameter indicationinformation is further used to indicate a power control parametercorresponding to another carrier bandwidth part, and at least one of theanother carrier bandwidth part is used to send data carried on a PUCCH,for a configuration manner of a power control parameter corresponding tothe at least one carrier bandwidth part, refer to the configurationmanner of the first power control parameter. Details are not describedherein again.

It should be noted that the first available PUCCH format and the secondavailable PUCCH format may be the same or different. This is not limitedin this embodiment of this application.

It can be learned that, in the embodiments of this application, thenetwork device does not need to configure a plurality of power controlparameters for each PUCCH format, and therefore signaling overheadsgenerated when the network device sends the power control parameterindication information can be reduced.

According to the foregoing embodiment, the network device may configure,for the terminal device in the configuration manner specific to acarrier bandwidth part, power control parameters corresponding tocarrier bandwidth parts, for example, the first power control parametercorresponding to the first carrier bandwidth part and/or the secondpower control parameter corresponding to the second carrier bandwidthpart. The power control parameters corresponding to the carrierbandwidth parts in the foregoing embodiment may be different. It shouldbe noted that when at least two carrier bandwidth parts can share apower control parameter (referred to as a common power control parameterbelow), the network device may directly allocate, to the terminal devicein the configuration manner specific to a cell or a carrier in theforegoing method, the common power control parameter that can be sharedby the at least two carrier bandwidth parts.

In this embodiment, the network device may alternatively send, to theterminal device, the common power control parameter that can be sharedby the at least two carrier bandwidth parts. Optionally, the commonpower control parameter may be carried in the power control parameterindication information, or certainly, may be carried in otherinformation. This is not limited in this embodiment of this application.Correspondingly, after determining a power control parameter that iscorresponding to at least one carrier bandwidth part and that isconfigured by the network device in the configuration manner specific toa carrier bandwidth part, and the common power control parameterconfigured by the network device in the configuration manner specific toa cell or a carrier, the terminal device determines a transmit powercorresponding to each carrier bandwidth part based on the common powercontrol parameter and a power control parameter corresponding to eachcarrier bandwidth part.

For example, after determining the first power control parameter that iscorresponding to the first carrier bandwidth part and that is configuredby the network device in the configuration manner specific to a carrierbandwidth part, and the common power control parameter configured by thenetwork device in the configuration manner specific to a cell or acarrier, the terminal device determines the first transmit powercorresponding to the first carrier bandwidth part based on the commonpower control parameter and the first power control parametercorresponding to the first carrier bandwidth part.

For another example, after determining the second power controlparameter that is corresponding to the second carrier bandwidth part andthat is configured by the network device in the configuration mannerspecific to a carrier bandwidth part, and the common power controlparameter configured by the network device in the configuration mannerspecific to a cell or a carrier, the terminal device determines thesecond transmit power corresponding to the second carrier bandwidth partbased on the common power control parameter and the second power controlparameter corresponding to the second carrier bandwidth part.

For another example, after determining the first power control parametercorresponding to the first carrier bandwidth part and the second powercontrol parameter corresponding to the second carrier bandwidth partthat are configured by the network device in the configuration mannerspecific to a carrier bandwidth part, and the common power controlparameter configured by the network device in the configuration mannerspecific to a cell or a carrier, the terminal device determines thefirst transmit power corresponding to the first carrier bandwidth partbased on the common power control parameter and the first power controlparameter corresponding to the first carrier bandwidth part, anddetermines the second transmit power corresponding to the second carrierbandwidth part based on the common power control parameter and thesecond power control parameter corresponding to the second carrierbandwidth part.

Optionally, when the first carrier bandwidth part is used to send thedata carried on the PUSCH, the first power control parameter may includeat least one of the following: the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,the first path loss compensation factor, and a first resource quantityparameter. Correspondingly, the common power control parameter mayinclude at least one of the following power control parameters otherthan the power control parameters corresponding to the first powercontrol parameter: a common open-loop power control parameter (forexample, P_(O_NOMINAL_PUSCH,c)), a common closed-loop power controlparameter (for example, f_(c)(0) or δ_(PUSCH,c)), a common maximumtransmit power parameter (for example, P_(CMAX,c)(i)), a common downlinkpath loss estimate (for example, PL_(c)), and a common path losscompensation factor (for example, α_(c)). For example, when the firstpower control parameter includes the first open-loop power controlparameter (for example, P_(O_UE_PUSCH,c,BWP1)), the common power controlparameter may include P_(O_NOMINAL_PUSCH,c). For another example, whenthe first power control parameter includes the first closed-loop powercontrol parameter (for example, δ_(PUSCH,c,BWP1)), the common powercontrol parameter may include f_(c)(0). For another example, when thefirst power control parameter includes the first closed-loop powercontrol parameter (for example, f_(c,BWP1)(0), the common power controlparameter may include δ_(PUSCH,c).

Optionally, when the first carrier bandwidth part is used to send thedata carried on the PUCCH, the first power control parameter may includeat least one of the following: the first open-loop power controlparameter, the first closed-loop power control parameter, the firstmaximum transmit power parameter, the first downlink path loss estimate,and the first PUCCH format related power control parameter.Correspondingly, the common power control parameter may include at leastone of the following power control parameters other than the powercontrol parameters corresponding to the first power control parameter: acommon open-loop power control parameter (for example,P_(O_NOMINAL_PUCCH,c)), a common closed-loop power control parameter(for example, g_(c)(0) or δ_(PUCCH,c)), a common maximum transmit powerparameter (for example, P_(CMAX,c)(i), a common downlink path lossestimate (for example, PL_(c)) and a common PUCCH format related powercontrol parameter (for example, Δ_(F_PUCCH,c)(F) and/or Δ_(TxD,c)(F′)).For example, when the first power control parameter includes the firstopen-loop power control parameter (for example, P_(O_UE_PUCCH,c,BWP1)),the common power control parameter may include P_(O_NOMINAL_PUCCH,c).For another example, when the first power control parameter includes thefirst closed-loop power control parameter (for example,δ_(PUCCH,c,BWP1)), the common power control parameter may includeg_(c)(0). For another example, when the first power control parameterincludes the first closed-loop power control parameter (for example,g_(c)(0)), the common power control parameter may include δ_(PUCCH,c).

Optionally, when the first carrier bandwidth part is used to send theSRS, the first power control parameter may include at least one of thefollowing: the first open-loop power control parameter, the firstclosed-loop power control parameter, the first maximum transmit powerparameter, the first downlink path loss estimate, and the first pathloss compensation factor. Correspondingly, the common power controlparameter may include at least one of the following power controlparameters other than the power control parameters corresponding to thefirst power control parameter: a common open-loop power controlparameter (for example, P_(O_NOMINAL_PUSCH,c)), a common closed-looppower control parameter (for example, c or δ_(PUSCH,c)), a commonmaximum transmit power parameter (for example, P_(CMAXc)(i), a commondownlink path loss estimate (for example, PL_(c)), and a common pathloss compensation factor (for example, α_(c)). For example, when thefirst power control parameter includes the first open-loop power controlparameter (for example, P_(O_UE_PUSCH,c,BWP1)), the common power controlparameter may include P_(O_NOMINAL_PUSCHc). For another example, whenthe first power control parameter includes the first closed-loop powercontrol parameter (for example, (PUSCH,c,BWP1 the common power controlparameter may include f_(c)(0). For another example, when the firstpower control parameter includes the first closed-loop power controlparameter (for example, f_(c,BWP1)(0)), the common power controlparameter may include δ_(PUSCH,c).

Similarly, when the second carrier bandwidth part is used to send thedata carried on the PUSCH, the second power control parameter mayinclude at least one of the following: the second open-loop powercontrol parameter, the second closed-loop power control parameter, thesecond maximum transmit power parameter, the second downlink path lossestimate, and the second path loss compensation factor. Correspondingly,the common power control parameter may include at least one of thefollowing power control parameters other than the power controlparameters corresponding to the second power control parameter: a commonopen-loop power control parameter (for example, P_(O_PUSCHc)), a commonclosed-loop power control parameter (for example, f_(c)(i)), a commonmaximum transmit power parameter (for example, P_(CMAXC)(i)), a commondownlink path loss estimate (for example, PL_(c)), a common path losscompensation factor (for example, α_(c)), and a PUCCH format relatedpower control parameter.

Optionally, when the second carrier bandwidth part is used to send thedata carried on the PUCCH, the second power control parameter mayinclude at least one of the following: the second open-loop powercontrol parameter, the second closed-loop power control parameter, thesecond maximum transmit power parameter, the second downlink path lossestimate, and the second PUCCH format related power control parameter.Correspondingly, the common power control parameter may include at leastone of the following power control parameters other than the powercontrol parameters corresponding to the second power control parameter:a common open-loop power control parameter (for example, P_(O_PUCCH,c)),a common closed-loop power control parameter (for example, g_(c)(i)), acommon maximum transmit power parameter (for example, P_(CMAX,c)(i)), acommon downlink path loss estimate (for example, PL_(c)), and a commonPUCCH format related power control parameter (for example,Δ_(F_PUCCH,c)(F) and/or Δ_(TxD,c)(F)).

Optionally, when the second carrier bandwidth part is used to send theSRS, the second power control parameter may include at least one of thefollowing: the second open-loop power control parameter, the secondclosed-loop power control parameter, the second maximum transmit powerparameter, the second downlink path loss estimate, and the second pathloss compensation factor. Correspondingly, the common power controlparameter may include at least one of the following power controlparameters other than the power control parameters corresponding to thesecond power control parameter: a common open-loop power controlparameter (for example, P_(O_PUSCHc)), a common closed-loop powercontrol parameter (for example, f_(c)(i)), a common maximum transmitpower parameter (for example, P_(CMAXc)(i)),and a common downlink pathloss estimate (for example, PL_(c)).

Certainly, the common power control parameter may further includeanother power control parameter. This is not limited in this embodimentof this application.

The following part is described by using an example in which theterminal device determines the first transmit power corresponding to thefirst carrier bandwidth part based on the common power control parameterand the first power control parameter corresponding to the first carrierbandwidth part.

When the first carrier bandwidth part is used to send the data carriedon the PUSCH, the terminal device substitutes the determined first powercontrol parameter for a corresponding power control parameter in theforegoing formula (1), and determines the first transmit power based onthe common power control parameter. For example, when the first powercontrol parameter includes the first open-loop power control parameter(for example, P_(O_PUSCH,c,BWP1)), and the common power controlparameter includes the common downlink path loss estimate (for example,PL_(c)), the terminal device substitutes the first open-loop powercontrol parameter (for example, P_(O_PUSCH,c,BWP1)) for P_(O_PUSCHc) inthe foregoing formula (1), and determines the first transmit power basedon the common power control parameter (for example, PL_(c)).

When the first carrier bandwidth part is used to send the data carriedon the PUCCH, the terminal device substitutes the determined first powercontrol parameter for a corresponding power control parameter in theforegoing formula (3), and determines the first transmit power based onthe common power control parameter. For example, when the first powercontrol parameter includes the first open-loop power control parameter(for example, P_(O_PUCCH,c,BWP1)), and the common power controlparameter includes the common downlink path loss estimate (for example,PL_(c)), the terminal device substitutes the first open-loop powercontrol parameter (for example, P_(O_PUCCH,c,BWP1)) for P_(O_PUCCH,c) inthe foregoing formula (3), and determines the first transmit power basedon the common power control parameter (for example, PL_(c)).

When the first carrier bandwidth part is used to send the SRS, theterminal device substitutes the determined first power control parameterfor a corresponding power control parameter in the foregoing formula(4), and determines the first transmit power based on the common powercontrol parameter. For example, when the first power control parameterincludes the first open-loop power control parameter (for example,P_(O_PUSCH,c,BWP1)) and the common power control parameter includes thecommon downlink path loss estimate (for example, PL_(c)), the terminaldevice substitutes the first open-loop power control parameter (forexample, P_(O_PUSCH,c,BWP1)) for P_(O_PUSCHc) in the foregoing formula(4), and determines the first transmit power based on the common powercontrol parameter (for example, PL_(c)).

It should be noted that for a manner of determining, by the terminaldevice based on the common power control parameter and a power controlparameter corresponding to any carrier bandwidth part, a transmit powercorresponding to the carrier bandwidth part, refer to the foregoingmanners of “determining, by the terminal device, the first transmitpower corresponding to the first carrier bandwidth part based on thecommon power control parameter and the first power control parametercorresponding to the first carrier bandwidth part”. Details are notdescribed herein again.

It can be learned that in this embodiment of this application, thenetwork device configures power control parameters for the terminaldevice in a manner of combining the configuration manner specific to acarrier bandwidth part and the configuration manner specific to a cellor a carrier, thereby achieving an objective of configuring differentpower control parameters for the terminal device based on differentcarrier bandwidth parts, so that the terminal device may sendinformation on different carrier bandwidth parts of a same carrier byusing different transmit powers.

In the foregoing embodiment provided in this application, the methodsprovided in the embodiments of this application are described from theperspectives of the network device, the terminal device, and interactionbetween the network device and the terminal device. To implement thefunctions in the methods provided in the foregoing embodiments of thisapplication, the network device and the terminal device each may includea hardware structure and/or a software module, to implement theforegoing functions by using the hardware structure, the softwaremodule, or a combination of the hardware structure and the softwaremodule. Whether one of the foregoing functions is performed by using ahardware structure, a software module, or a combination of a hardwarestructure and a software module depends on particular applications anddesign constraints of the technical solutions.

An embodiment of this application provides an apparatus, configured toimplement the functions of the terminal device in the foregoing methods.The apparatus may be a terminal device, or may be an apparatus in aterminal device. FIG. 3 is a schematic structural diagram of anapparatus according to an embodiment of this application. As shown inFIG. 3, the apparatus includes a receiving module 301 and a sendingmodule 302. The receiving module 301 is configured to receive powercontrol parameter indication information. The sending module 302 isconfigured to send first uplink information on a first carrier bandwidthpart based on a first transmit power, where the first transmit power isdetermined based on a first power control parameter, and the first powercontrol parameter is determined based on the power control parameterindication information. The sending module 302 is further configured tosend second uplink information on a second carrier bandwidth part basedon a second transmit power, where the second transmit power isdetermined based on a second power control parameter, and the secondpower control parameter is determined based on the power controlparameter indication information. The first carrier bandwidth part andthe second carrier bandwidth part are located in a same carrier.

Specifically, the receiving module 301 and the sending module 302 mayperform corresponding functions performed by the terminal device in themethod embodiment corresponding to FIG. 2. Details are not describedherein again.

Module division in the apparatus embodiments of this application is anexample, is merely logical function division, and may be other divisionin actual implementation. In addition, function modules in theembodiments of this application may be integrated into one processor, oreach of the modules may exist alone physically, or two or more modulesmay be integrated into one module. The integrated module may beimplemented in a form of hardware, or may be implemented in a form of asoftware function module.

FIG. 4 is a schematic structural diagram of an apparatus according toanother embodiment of this application. As shown in FIG. 4, an apparatus400 provided in this embodiment of this application is configured toimplement the functions of the terminal device in the foregoing method.The apparatus may be a terminal device, or may be an apparatus in aterminal device. The apparatus may be a chip system. In the embodimentsof this application, the chip system may include a chip, or may includea chip and another discrete device. The apparatus 400 includes aprocessor 420, configured to implement the functions of the terminaldevice in the methods provided in the embodiments of this application.For example, the processor 420 may receive and process power controlparameter indication information, generate first uplink information andsecond uplink information, and send the generated uplink information.For details, refer to the detailed descriptions in the method examples.Details are not described herein again.

The apparatus 400 may further include a memory 430, configured to storea program instruction and/or data. The memory 430 is coupled with theprocessor 420. Couplings in the embodiments of this application areindirect couplings or communications connections between apparatuses,units, or modules, and may be electrical, mechanical, or in anotherform, and are used for information exchange between the apparatuses, theunits, and the modules. The processor 420 and the memory 430 may performan operation cooperatively. The processor 420 may invoke and execute theprogram instruction stored in the memory 430.

The apparatus 400 may further include a transceiver 410, configured tocommunicate with another device through a transmission medium, so thatan apparatus in the apparatus 400 may communicate with another device.For example, the another device may be a network device. The processor420 sends or receives data by using the transceiver 410, and isconfigured to implement the method performed by the terminal device inFIG. 2. In an implementation process, steps of a processing proceduremay be performed by using an integrated logic circuit of hardware in theprocessor 420 or an instruction in a form of software.

A specific connection medium between the transceiver 410, the processor420, and the memory 430 is not limited in this embodiment of thisapplication. In this embodiment of this application, the memory 430, theprocessor 420, and the transceiver 410 are connected by using a bus 440in FIG. 4. The bus is represented by using a bold line in FIG. 4. Amanner of a connection between other components is merely an example fordescription, and imposes no limitation. The bus may be classified intoan address bus, a data bus, a control bus, or the like. For ease ofrepresentation, the bus is represented by using only one bold line inFIG. 4. However, it does not mean that there is only one bus or only onetype of bus.

An embodiment of this application provides an apparatus, configured toimplement the functions of the network device in the foregoing methods.The apparatus may be a network device, or may be an apparatus in anetwork device. FIG. 5 is a schematic structural diagram of an apparatusaccording to another embodiment of this application. As shown in FIG. 5,the apparatus includes a sending module 501 and a receiving module 502.These modules may perform corresponding functions performed by thenetwork device in the method embodiment corresponding to FIG. 2. Thesending module 501 is configured to send power control parameterindication information, where the power control parameter indicationinformation includes a first power control parameter and a second powercontrol parameter, the first power control parameter is used todetermine a first transmit power for transmitting data on a firstcarrier bandwidth part, and the second power control parameter is usedto determine a second transmit power for transmitting data on a secondcarrier bandwidth part. The receiving module 502 is configured toreceive first uplink information on the first carrier bandwidth part,where a transmit power of the first uplink information is the firsttransmit power. The receiving module 502 is further configured toreceive second uplink information on the second carrier bandwidth part,where a transmit power of the second uplink information is the secondtransmit power. The first carrier bandwidth part and the second carrierbandwidth part are located in a same carrier.

Specifically, the sending module 501 and the receiving module 502 mayperform the corresponding functions performed by the network device inthe method embodiment corresponding to FIG. 2. Details are not describedherein again.

FIG. 6 is a schematic structural diagram of an apparatus according toanother embodiment of this application. As shown in FIG. 6, an apparatus600 provided in this embodiment of this application is configured toimplement the functions of the network device in the foregoing method.The apparatus may be a network device, or may be an apparatus in anetwork device. The apparatus may be a chip system. The apparatus 600includes a processor 620, configured to implement the functions of thenetwork device in the methods provided in the embodiments of thisapplication. For example, the processor 620 may generate and send powercontrol parameter indication information, and receive first uplinkinformation and second uplink information. For details, refer to thedetailed descriptions in the method example. Details are not describedherein again.

The apparatus 600 may further include a memory 630, configured to storea program instruction and/or data. The memory 630 is coupled with theprocessor 620. Couplings in the embodiments of this application areindirect couplings or communications connections between apparatuses,units, or modules, and may be electrical, mechanical, or in anotherform, and are used for information exchange between the apparatuses, theunits, and the modules. The processor 620 and the memory 630 may performan operation cooperatively. The processor 620 may invoke and execute theprogram instruction stored in the memory 630.

The apparatus 600 may further include a transceiver 610, configured tocommunicate with another device through a transmission medium, so thatan apparatus in the apparatus 600 may communicate with another device.For example, the another device may be a terminal device. The processor620 sends or receives data by using the transceiver 610, and isconfigured to implement the method performed by the network device inthe embodiment corresponding to FIG. 2. Further, the processor 620 mayprocess data received by the transceiver 610.

A specific connection medium between the transceiver 610, the processor620, and the memory 630 is not limited in this embodiment of thisapplication. In this embodiment of this application, the memory 630, theprocessor 620, and the transceiver 610 are connected by using a bus 640in FIG. 6. The bus is represented by using a bold line in FIG. 6. Amanner of a connection between other components is merely an example fordescription, and imposes no limitation. The bus may be classified intoan address bus, a data bus, a control bus, or the like. For ease ofrepresentation, the bus is represented by using only one bold line inFIG. 6. However, it does not mean that there is only one bus or only onetype of bus.

In the embodiments of this application, the processor may be a generalpurpose processor, a digital signal processor, an application-specificintegrated circuit, a field programmable gate array or anotherprogrammable logic device, a discrete gate or transistor logic device,or a discrete hardware component, and may implement or perform themethods, steps, and logical block diagrams disclosed in the embodimentsof this application. The general purpose processor may be amicroprocessor, any conventional processor, or the like. The steps ofthe method disclosed with reference to the embodiments of thisapplication may be directly performed by a hardware processor, or may beperformed by using a combination of hardware in the processor and asoftware module.

In the embodiments of this application, the memory may be a nonvolatilememory, such as a hard disk drive (HDD) or a solid-state drive (SSD), ormay be a volatile memory (volatile memory), such as a random accessmemory (RAM). The memory is any other medium that can be configured tocarry or store expected program code in a form of an instruction or adata structure and that can be accessed by a computer, but is notlimited thereto.

An embodiment of this application further provides a communicationssystem. The communications system includes a network device and at leastone terminal device. The network device may be of the structure in theapparatus embodiment shown in FIG. 5 and/or FIG. 6. Correspondingly, thenetwork device may perform the technical solutions provided in the powercontrol method embodiment. The terminal device may be of the structurein the apparatus embodiment shown in FIG. 3 and/or FIG. 4.Correspondingly, the terminal device may perform the technical solutionsprovided in the power control method embodiment. Specific implementationprinciples and technical effects thereof are similar. Details are notdescribed herein again.

In the several embodiments provided in this application, it should beunderstood that the disclosed apparatus and method may be implemented inother manners. For example, the described apparatus embodiment is merelyan example. For example, the unit division is merely logical functiondivision and may be other division in actual implementation. Forexample, a plurality of units or components may be combined orintegrated into another system, or some features may be ignored or notperformed. In addition, the shown or discussed mutual couplings ordirect couplings or communications connections may be implemented byusing some interfaces. The indirect couplings or communicationsconnections between the apparatuses or units may be implemented inelectrical, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparated, and parts shown as units may or may not be physical units,may be located in one position, or may be distributed on a plurality ofnetwork units. Some or all of the units may be selected according toactual requirements to achieve the objectives of the solutions of theembodiments.

In addition, function units in the embodiments of this application maybe integrated into one processing unit, or each of the units may existalone physically, or two or more units may be integrated into one unit.The integrated unit may be implemented in a form of hardware, or may beimplemented in a form of hardware and a software function unit.

A person of ordinary skill in the art may understand that sequencenumbers of the foregoing processes do not mean execution sequences invarious embodiments of this application. The execution sequences of theprocesses should be determined based on functions and internal logic ofthe processes, and should not be construed as any limitation on theimplementation processes of the embodiments of this application.

All or some of the foregoing embodiments may be implemented by usingsoftware, hardware, firmware, or any combination thereof. When softwareis used to implement the embodiments, the embodiments may be implementedcompletely or partially in a form of a computer program product. Thecomputer program product includes one or more computer instructions.When the computer program instructions are loaded and executed on acomputer, some or all of the procedures or functions according to theembodiments of this application are generated. The computer may be ageneral purpose computer, a dedicated computer, a computer network, oranother programmable apparatus. The computer instructions may be storedin a computer readable storage medium or transmitted from a computerreadable storage medium to another computer readable storage medium. Forexample, the computer instructions may be transmitted from a website,computer, server, or data center to another website, computer, server,or data center in a wired (for example, a coaxial cable, an opticalfiber, or a digital subscriber line (DSL)) or wireless (for example,infrared, radio, or microwave) manner. The computer readable storagemedium may be any usable medium accessible to a computer, or a datastorage device, such as a server or a data center, integrating one ormore usable media. The usable medium may be a magnetic medium (forexample, a floppy disk, a hard disk drive, or a magnetic tape), anoptical medium (for example, a DVD), a semiconductor medium (forexample, a solid state drive (SSD)), or the like.

The foregoing descriptions are only specific implementations of thepresent invention, but are not intended to limit the protection scope ofthe present invention. Any variation or replacement readily figured outby a person skilled in the art within the technical scope disclosed inthe present invention shall fall within the protection scope of thepresent invention. Therefore, the protection scope of the presentinvention shall be subject to the protection scope of the claims.

The following examples are provided:

Example 1

A power control method, comprising: receiving power control parameterindication information, and sending uplink information on a bandwidthpart based on a transmit power, wherein the transmit power is determinedbased on a power control parameter specific to the bandwidth part, andthe power control parameter specific to the bandwidth part is determinedbased on the power control parameter indication information.

Example 2

The method according to example 1, wherein the power control parameterspecific to the bandwidth part comprises an open-loop power controlparameter specific to the bandwidth part, a closed-loop power controlparameter specific to the bandwidth part, and/or a downlink path lossestimate specific to the bandwidth part.

Example 3

The method according to example 1 or 2, wherein that the power controlparameter specific to the bandwidth part is determined based on thepower control parameter indication information comprises the powercontrol parameter specific to the bandwidth part is determined based ona reference power control parameter, a reference transmission parameter,and a transmission parameter of the bandwidth part, wherein thereference power control parameter is determined based on the powercontrol parameter indication information.

Example 4

The method according to example 3, wherein the reference transmissionparameter comprises reference bandwidth, and the transmission parameterof the bandwidth part comprises bandwidth of the bandwidth part, thereference transmission parameter comprises a reference subcarrierspacing, and the transmission parameter of the bandwidth part comprisesa subcarrier spacing of the bandwidth part, and/or the referencetransmission parameter comprises a reference cyclic prefix type, and thetransmission parameter of the bandwidth part comprises a cyclic prefixtype of the bandwidth part.

Example 5

The method according to example 3 or 4, wherein the power controlparameter specific to the bandwidth part comprises the open-loop powercontrol parameter specific to the bandwidth part, and the referencepower control parameter comprises a reference open-loop power controlparameter, and/or the power control parameter specific to the bandwidthpart comprises the closed-loop power control parameter specific to thebandwidth part, and the reference power control parameter comprises areference closed-loop power control parameter.

Example 6

The method according to any one of examples 1 to 5, wherein the uplinkinformation comprises data carried on a physical uplink control channel(PUCCH), a PUCCH format of the PUCCH is a preset PUCCH format of thebandwidth part, and the preset PUCCH format of the bandwidth part issome or all of available PUCCH formats of the bandwidth part.

Example 7

The method according to any one of examples 1 to 6, wherein that thetransmit power is determined based on a power control parameter specificto the bandwidth part comprises the transmit power is determined basedon the power control parameter specific to the bandwidth part and acommon power control parameter, wherein the common power controlparameter is a common power control parameter of a carrier in which thebandwidth part is located.

Example 8

The method according to example 7, wherein the method further comprisesreceiving the common power control parameter.

Example 9

The method according to example 7 or 8, wherein the common power controlparameter comprises a common open-loop power control parameter.

Example 10

The method according to any one of examples 2, 5, and 9, wherein theopen-loop power control parameter comprises an expected receive power.

Example 11

The method according to example 2 or 5, wherein the closed-loop powercontrol parameter comprises an initial value of a power adjustmentvalue.

Example 12

A power control method, comprising sending power control parameterindication information, wherein the power control parameter indicationinformation is used to indicate a power control parameter specific to abandwidth part, and receiving uplink information on the bandwidth part.

Example 13

The method according to example 12, wherein the power control parameterspecific to the bandwidth part comprises an open-loop power controlparameter specific to the bandwidth part, a closed-loop power controlparameter specific to the bandwidth part, and/or a downlink path lossestimate specific to the bandwidth part.

Example 14

The method according to example 12 or 13, wherein the uplink informationcomprises data carried on a physical uplink control channel (PUCCH), aPUCCH format of the PUCCH is a preset PUCCH format of the bandwidthpart, and the preset PUCCH format of the bandwidth part is some or allof available PUCCH formats of the bandwidth part.

Example 15

The method according to any one of examples 12 to 14, wherein the methodfurther comprises sending a common power control parameter, wherein thecommon power control parameter is a common power control parameter of acarrier in which the bandwidth part is located.

Example 16

The method according to example 15, wherein the common power controlparameter comprises a common open-loop power control parameter.

Example 17

The method according to example 13 or 16, wherein the open-loop powercontrol parameter comprises an expected receive power.

Example 18

The method according to example 13, wherein the closed-loop powercontrol parameter comprises an initial value of a power adjustmentvalue.

Example 19

A communications apparatus, comprising a processor and a transceiver,wherein the processor receives power control parameter indicationinformation by using the transceiver, and the processor sends uplinkinformation on a bandwidth part based on a transmit power by using thetransceiver, wherein the transmit power is determined based on a powercontrol parameter specific to the bandwidth part, and the power controlparameter specific to the bandwidth part is determined based on thepower control parameter indication information.

Example 20

The communications apparatus according to example 19, wherein the powercontrol parameter specific to the bandwidth part comprises an open-looppower control parameter specific to the bandwidth part, a closed-looppower control parameter specific to the bandwidth part, and/or adownlink path loss estimate specific to the bandwidth part.

Example 21

The communications apparatus according to example 19 or 20, wherein thatthe power control parameter specific to the bandwidth part is determinedbased on the power control parameter indication information comprisesthe power control parameter specific to the bandwidth part is determinedbased on a reference power control parameter, a reference transmissionparameter, and a transmission parameter of the bandwidth part, whereinthe reference power control parameter is determined based on the powercontrol parameter indication information.

Example 22

The communications apparatus according to example 21, wherein thereference transmission parameter comprises reference bandwidth, and thetransmission parameter of the bandwidth part comprises bandwidth of thebandwidth part, the reference transmission parameter comprises areference subcarrier spacing, and the transmission parameter of thebandwidth part comprises a subcarrier spacing of the bandwidth part,and/or the reference transmission parameter comprises a reference cyclicprefix type, and the transmission parameter of the bandwidth partcomprises a cyclic prefix type of the bandwidth part.

Example 23

The communications apparatus according to example 21 or 22, wherein thepower control parameter specific to the bandwidth part comprises theopen-loop power control parameter specific to the bandwidth part, andthe reference power control parameter comprises a reference open-looppower control parameter, and/or the power control parameter specific tothe bandwidth part comprises the closed-loop power control parameterspecific to the bandwidth part, and the reference power controlparameter comprises a reference closed-loop power control parameter.

Example 24

The communications apparatus according to any one of examples 19 to 23,wherein the uplink information comprises data carried on a physicaluplink control channel (PUCCH), a PUCCH format of the PUCCH is a presetPUCCH format of the bandwidth part, and the preset PUCCH format of thebandwidth part is some or all of available PUCCH formats of thebandwidth part.

Example 25

The communications apparatus according to any one of examples 19 to 24,wherein that the transmit power is determined based on a power controlparameter specific to the bandwidth part comprises the transmit power isdetermined based on the power control parameter specific to thebandwidth part and a common power control parameter, wherein the commonpower control parameter is a common power control parameter of a carrierin which the bandwidth part is located.

Example 26

The communications apparatus according to example 25, wherein theprocessor receives the common power control parameter by using thetransceiver.

Example 27

The communications apparatus according to example 25 or 26, wherein thecommon power control parameter comprises a common open-loop powercontrol parameter.

Example 28

The communications apparatus according to any one of examples 20, 23,and 27, wherein the open-loop power control parameter comprises anexpected receive power.

Example 29

The communications apparatus according to example 20 or 23, wherein theclosed-loop power control parameter comprises an initial value of apower adjustment value.

Example 30

A communications apparatus, configured to implement the method accordingto any one of examples 1 to 11.

Example 31

An apparatus, comprising a processor and a memory, wherein the memory isconfigured to store a program instruction, and the processor isconfigured to invoke and execute the program instruction stored in thememory, to implement the method according to any one of examples 1 to11.

Example 32

A communications apparatus, comprising a processor and a transceiver,wherein the processor sends power control parameter indicationinformation by using the transceiver, wherein the power controlparameter indication information is used to indicate a power controlparameter specific to a bandwidth part, and the processor receivesuplink information on the bandwidth part by using the transceiver.

Example 33

The communications apparatus according to example 32, wherein the powercontrol parameter specific to the bandwidth part comprises an open-looppower control parameter specific to the bandwidth part, a closed-looppower control parameter specific to the bandwidth part, and/or adownlink path loss estimate specific to the bandwidth part.

Example 34

The communications apparatus according to example 32 or 33, wherein theuplink information comprises data carried on a physical uplink controlchannel (PUCCH), a PUCCH format of the PUCCH is a preset PUCCH format ofthe bandwidth part, and the preset PUCCH format of the bandwidth part issome or all of available PUCCH formats of the bandwidth part.

Example 35

The communications apparatus according to any one of examples 32 to 34,wherein the processor sends a common power control parameter by usingthe transceiver, and the common power control parameter is a commonpower control parameter of a carrier in which the bandwidth part islocated.

Example 36

The communications apparatus according to example 35, wherein the commonpower control parameter comprises a common open-loop power controlparameter.

Example 37

The communications apparatus according to example 33 or 36, wherein theopen-loop power control parameter comprises an expected receive power.

Example 38

The communications apparatus according to example 33, wherein theclosed-loop power control parameter comprises an initial value of apower adjustment value.

Example 39

A communications apparatus, configured to implement the method accordingto any one of examples 12 to 18.

Example 40

An apparatus, comprising a processor and a memory, wherein the memory isconfigured to store a program instruction, and the processor isconfigured to invoke and execute the program instruction stored in thememory, to implement the method according to any one of examples 12 to18.

Example 41

A computer readable storage medium, wherein the computer readablestorage medium stores an instruction, and when the instruction runs on acomputer, the computer is enabled to perform the method according to anyone of examples 1 to 18.

Example 42

A computer program product comprising an instruction, wherein when theinstruction runs on a computer, the computer is enabled to perform themethod according to any one of examples 1 to 18.

Example 43

A communications system, comprising the apparatus according to any oneof examples 19 to 31, and the apparatus according to any one of examples32 to 40.

What is claimed is:
 1. A power control method, comprising: sendingindication information, wherein the indication information indicates aspecific power control parameter for a first bandwidth part; andreceiving uplink information on the first bandwidth part, wherein atransmit power of the uplink information is based on the specific powercontrol parameter and is further based on a common power controlparameter of one carrier in which at least the first bandwidth part anda second bandwidth part of a terminal device are disposed, and whereinthe common power control parameter is common to the first bandwidth partand the second bandwidth part.
 2. The method according to claim 1,wherein the specific power control parameter is independent of a powercontrol parameter specific to the second bandwidth part.
 3. The methodaccording to claim 1, wherein the specific power control parametercomprises a specific open-loop power control parameter.
 4. The methodaccording to claim 1, wherein the specific power control parametercomprise a power offset of an expected power for demodulation.
 5. Themethod according to claim 1, wherein the method further comprisessending the common power control parameter.
 6. The method according toclaim 1, wherein the common power control parameter comprises a commonopen-loop power control parameter.
 7. The method according to claim 1,wherein the common power control parameter comprises an expected powerfor demodulation.
 8. A communications apparatus, comprising atransmitter, configured to send indication information, wherein theindication information indicates a specific power control parameter fora first bandwidth part; and a receiver, configured to receive uplinkinformation on the first bandwidth part, wherein a transmit power of theuplink information is based on the specific power control parameter andis further based on a common power control parameter of one carrier inwhich at least the first bandwidth part and a second bandwidth part of aterminal device are disposed, and wherein the common power controlparameter is common to the first bandwidth part and the second bandwidthpart.
 9. The communications apparatus according to claim 8, wherein thespecific power control parameter is independent of a power controlparameter specific to the second bandwidth part.
 10. The communicationsapparatus according to claim 8, wherein the specific power controlparameter comprises a specific open-loop power control parameter. 11.The communications apparatus according to claim 8, wherein the specificpower control parameter comprise a power offset of an expected power fordemodulation.
 12. The communications apparatus according to claim 8,wherein the transmitter is further configured to send the common powercontrol parameter.
 13. The communications apparatus according to claim8, wherein the common power control parameter comprises a commonopen-loop power control parameter.
 14. The communications apparatusaccording to claim 8, wherein the common power control parametercomprises an expected power for demodulation.
 15. A communicationssystem, comprising: a first apparatus, comprising: a processor; and anon-transitory computer-readable storage medium storing a program to beexecuted by the processor, wherein the program includes instructions to:send indication information, wherein the indication informationindicates a specific power control parameter for a first bandwidth part;and receive uplink information on the first bandwidth part; and a secondapparatus, comprising: a processor; and a non-transitorycomputer-readable storage medium storing a program to be executed by theprocessor, wherein the program includes instructions to: receive theindication information; and send the uplink information on the firstbandwidth part by using a transmit power, wherein the transmit power isbased on the specific power control parameter and is further based on acommon power control parameter of one carrier in which at least thefirst bandwidth part and a second bandwidth part of a terminal deviceare disposed, and wherein the common power control parameter is commonto the first bandwidth part and the second bandwidth part.
 16. Thecommunications system according to claim 15, wherein the specific powercontrol parameter comprises a specific open-loop power controlparameter, and the common power control parameter comprises a commonopen-loop power control parameter.
 17. The communications systemaccording to claim 15, wherein the specific power control parametercomprise a power offset of an expected power for demodulation.
 18. Theapparatus according to claim 15, wherein the common power controlparameter comprises an expected power for demodulation.
 19. Anon-transitory computer readable medium, wherein the non-transitorycomputer readable medium stores instructions, that, when executed on acomputer, cause the computer to: send indication information, whereinthe indication information indicates a specific power control parameterfor a first bandwidth part; and receive uplink information on the firstbandwidth part, wherein a transmit power of the uplink information isbased on the specific power control parameter and is further based on acommon power control parameter of one carrier in which at least thefirst bandwidth part and a second bandwidth part of a terminal deviceare disposed, and wherein the common power control parameter is commonto the first bandwidth part and the second bandwidth part.
 20. Thenon-transitory computer readable medium according to claim 19, whereinthe specific power control parameter comprises a specific open-looppower control parameter, and the common power control parametercomprises a common open-loop power control parameter.